The Western Digital WD Black WD4006FZBX internal hard drive combines high capacity, speed, and reliability, making it a suitable choice for gamers and professionals. With a generous 4 TB of storage, users can store vast amounts of data. It operates at a spindle speed of 7200 rpm, ensuring quick access to data and smooth performance. The drive's 256 MB DRAM cache and Serial ATA-600 interface facilitate a fast data transfer rate of 600 MBps, enhancing the efficiency of data retrieval and storage. Advanced features such as Advanced Format technology and Conventional magnetic recording (CMR), and a robust DRAM cache system contribute to its performance. Additionally, the hard drive is designed with durability in mind, featuring high shock tolerance to protect your data. Its compliance with various standards, including RoHS, FCC, and UL, underscores its reliability and commitment to environmental sustainability. With low power consumption and a focus on gaming optimization, the WD Black WD4006FZBX is a suitable upgrade for users seeking performance and capacity.
The Western Digital WD Black WD4006FZBX internal hard drive combines high capacity, speed, and reliability, making it a suitable choice for gamers and professionals. With a generous 4 TB of storage, users can store vast amounts of data. It operates at a spindle speed of 7200 rpm, ensuring quick access to data and smooth performance. The drive's 256 MB DRAM cache and Serial ATA-600 interface facilitate a fast data transfer rate of 600 MBps, enhancing the efficiency of data retrieval and storage. Advanced features such as Advanced Format technology and Conventional magnetic recording (CMR), and a robust DRAM cache system contribute to its performance. Additionally, the hard drive is designed with durability in mind, featuring high shock tolerance to protect your data. Its compliance with various standards, including RoHS, FCC, and UL, underscores its reliability and commitment to environmental sustainability. With low power consumption and a focus on gaming optimization, the WD Black WD4006FZBX is a suitable upgrade for users seeking performance and capacity.
The Western Digital WD Black WD4006FZBX internal hard drive combines high capacity, speed, and reliability, making it a suitable choice for gamers and professionals. With a generous 4 TB of storage, users can store vast amounts of data. It operates at a spindle speed of 7200 rpm, ensuring quick access to data and smooth performance. The drive's 256 MB DRAM cache and Serial ATA-600 interface facilitate a fast data transfer rate of 600 MBps, enhancing the efficiency of data retrieval and storage. Advanced features such as Advanced Format technology and Conventional magnetic recording (CMR), and a robust DRAM cache system contribute to its performance. Additionally, the hard drive is designed with durability in mind, featuring high shock tolerance to protect your data. Its compliance with various standards, including RoHS, FCC, and UL, underscores its reliability and commitment to environmental sustainability. With low power consumption and a focus on gaming optimization, the WD Black WD4006FZBX is a suitable upgrade for users seeking performance and capacity.
The Western Digital WD Black WD4006FZBX internal hard drive combines high capacity, speed, and reliability, making it a suitable choice for gamers and professionals. With a generous 4 TB of storage, users can store vast amounts of data. It operates at a spindle speed of 7200 rpm, ensuring quick access to data and smooth performance. The drive's 256 MB DRAM cache and Serial ATA-600 interface facilitate a fast data transfer rate of 600 MBps, enhancing the efficiency of data retrieval and storage. Advanced features such as Advanced Format technology and Conventional magnetic recording (CMR), and a robust DRAM cache system contribute to its performance. Additionally, the hard drive is designed with durability in mind, featuring high shock tolerance to protect your data. Its compliance with various standards, including RoHS, FCC, and UL, underscores its reliability and commitment to environmental sustainability. With low power consumption and a focus on gaming optimization, the WD Black WD4006FZBX is a suitable upgrade for users seeking performance and capacity.
Last updated at 03/03/2026 11:31:21
Wd2003fzex-00srla0 Dcm: Hhncnvjmh Wmc6n Western Digital 2tb
Delivery $46.75
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originally posted on newegg.com
Bought this 2TB WD Black on it's reputation, previous experience, and 5 year warranty. I've had many of these over the years, and all have well outlived their manufacturer warranty period. That said, it appears that WD may have given up on protecting the reputation of their HDD's, as they slowly move over to the SSD business. The drive arrived quick from NewEgg, packed in the usual, sloppy manner: in the bottom of a box, with no cushioning on the bottom, all cushioning was on the sides and top. That said, I doubt that rough handling in shipment caused this issue, however- as the box was perfectly intact upon arrival...this time, anyway...NewEgg really needs to re-train their order fulfillment staff to properly cushion shock-sensitive product on ALL SIX SIDES of the ... MoreBought this 2TB WD Black on it's reputation, previous experience, and 5 year warranty. I've had many of these over the years, and all have well outlived their manufacturer warranty period. That said, it appears that WD may have given up on protecting the reputation of their HDD's, as they slowly move over to the SSD business. The drive arrived quick from NewEgg, packed in the usual, sloppy manner: in the bottom of a box, with no cushioning on the bottom, all cushioning was on the sides and top. That said, I doubt that rough handling in shipment caused this issue, however- as the box was perfectly intact upon arrival...this time, anyway...NewEgg really needs to re-train their order fulfillment staff to properly cushion shock-sensitive product on ALL SIX SIDES of the package...It's really not asking much... I powered up the drive, formatted it, and on the very first spindown, it was apparent that the bearings were not healthy. It makes a noise that is a combination of a loud whine, with some grind to it- sounds just like a dying cow. Unfortunately, after doing some quick research on the internet, it appears that for the past six months or so, a lot of people have been receiving drives that exhibit this horrible noise on spindown, and WD has not commented on it as of yet... The noise is the sound of a slow death, and I'm not keeping it. I have opened an RMA with NewEgg, and will be sending it back for replacement immediately. I will allow just one chance here for them to send a good, non defective brand new replacement drive- but if the new one arrives and has any issues whatsoever, I'll be asking for my money back, as I don't have time to play the RMA shuffle until I get a good one. Sadly, it seems that the quality of the HDD product at WD isn't what it used to be. I do understand that occasional defects can happen, but after reading of so many other people encountering this same "dead cow" noise on spindown- I'm afraid that this may spell the end of the good HDD's. If SSD in a 2TB size were less expensive, I wouldn't even be thinking of getting a replacement for this thing, but the pricing on those is still extortive at this point, so.... ,,,,,,,,,,,,,,,,,,,,,_ EDIT: I received the replacement drive today (2018-01-16). Defective right out of the box. Makes the same whining, grinding, dying cow noise that the last drive made on spindown, like the bearing is damaged or the platter is out of balance. At this point, I can only assume that WD is moving out whatever junk parts they have left on the shelf, in preparation to move solely to the SSD market. I'm on hold now so I can get a return shipping label or call tag, and a refund. I'm not doing this over and over again until I finally get a working drive. I'm done...
originally posted on neweggbusiness.com
So my son who is an avid PC gamer. His PC prior to this purchase had a 1TB Intel 660P NVME drive for OS and apps/games and a 1TB WD Blue mechanical drive. Of course, he also installed games on the WD Blue drive and is always out of space. He wanted something with more storage and I cautiously recommended the WD Black 6TB drive base don name, hopefully quality and reliability associated with the WD brand and of course the performance that WD Black implies. Pricing wise, not sure if I got a good deal or not. I suspect these drives are drying up because I do not believe they are actively being manufactured anymore. All that being said, installation was straightforward. Was proud of myself for cloning the 1TB mechanical WD Blue drive to the WD Black and then using tools ... MoreSo my son who is an avid PC gamer. His PC prior to this purchase had a 1TB Intel 660P NVME drive for OS and apps/games and a 1TB WD Blue mechanical drive. Of course, he also installed games on the WD Blue drive and is always out of space. He wanted something with more storage and I cautiously recommended the WD Black 6TB drive base don name, hopefully quality and reliability associated with the WD brand and of course the performance that WD Black implies. Pricing wise, not sure if I got a good deal or not. I suspect these drives are drying up because I do not believe they are actively being manufactured anymore. All that being said, installation was straightforward. Was proud of myself for cloning the 1TB mechanical WD Blue drive to the WD Black and then using tools to convert the cloned image from MBR to GPT once it was laid back down on the Black drive and expand the partition to the full 5.35GB readable by Windows. After all said and done, everything just worked and all the game installs and other things on the new Black drive worked without incident. This drive does make a bit more "noise" than the Blue it replaced. I assume there are more platters in it and that they may be at a different spindle speed than the Blue drive it replaced. Anyway, drive noise just makes me nervous. Other reviews indicate that this drive runs warmer than other drives and while I cannot say one way or the other, I do worry about temperatures overall in the PC it is installed in. Paranoia aside that a spindle drive is doomed to fail out of the box, performance wise this drive does seem to perform well. Games that were installed on it, do launch quicker than when they were on the Blue. Another interesting observation. We are fortunate to have 1Gb FIOS internet. When downloading and installing games from Steam onto the Intel 660p, it doesn't take long for the write cache of the Intel 660p to saturate and write speeds drop to a crawl. However, when downloading games from Steam to the WD Black, the write speeds while downloading large games seems to be more consistent and maintain a higher median level. I suspect the write cache in the Black is larger and maybe managed better than the Intel 660p even though it is an NVME. Of course reviews for Intel 660p do suggest that it really does suffer when its write cache is saturated. Overall, my son is very happy with this drive. As long as it lasts and gives him good service, I am cautiously optimistic. I really do think that we need to get good quality consumer grade SSD/NVME drives at mechanical HDD prices if we want to drive PC storage forward. I would have loved to purchase a 2.5" form factor SSD of the same size but prices are just too high once you get beyond 2TB.
originally posted on westerndigital.com
I bought this to convert movie files to folders of tif images. (tif images are basically bit maps that can hold movie color space. They're huge.) It is able to keep up with the image processing program I have that outputs to that. The other hard drive I was using could not keep up and would slow the whole thing down.I'm impressed with the capacity and ability of this drive compared to the price.I'm taking a star off because this drive disappears for about 15 seconds every hour or so. Everything that's using it freezes until it comes back. I doubt that's normal behavior, but since I'm only storing temporary data on it, and it always comes back, so I don't think it needs a replacement.I don't remember if this has RAM or what, but when writing to it, it can take ... MoreI bought this to convert movie files to folders of tif images. (tif images are basically bit maps that can hold movie color space. They're huge.) It is able to keep up with the image processing program I have that outputs to that. The other hard drive I was using could not keep up and would slow the whole thing down.I'm impressed with the capacity and ability of this drive compared to the price.I'm taking a star off because this drive disappears for about 15 seconds every hour or so. Everything that's using it freezes until it comes back. I doubt that's normal behavior, but since I'm only storing temporary data on it, and it always comes back, so I don't think it needs a replacement.I don't remember if this has RAM or what, but when writing to it, it can take about 5GB really fast. Then it slows down to about 160MB per second, plus or minus 10. For reference, gigabit ethernet caps at 115MB per second. (These are all numbers displayed by Windows OS.)
Wd2003fzex-00srla0 Dcm: Hhncnvjmh Wmc6n Western Digital 2tb
Delivery $46.75
Affiliate Disclosure: We may receive a small commission for purchases made through this link at no extra cost to you. This helps support our site. Thank you!
Bought this 2TB WD Black on it's reputation, previous experience, and 5 year warranty. I've had many of these over the years, and all have well outlived their manufacturer warranty period. That said, it appears that WD may have given up on protecting the reputation of their HDD's, as they slowly move over to the SSD business. The drive arrived quick from NewEgg, packed in the usual, sloppy manner: in the bottom of a box, with no cushioning on the bottom, all cushioning was on the sides and top. That said, I doubt that rough handling in shipment caused this issue, however- as the box was perfectly intact upon arrival...this time, anyway...NewEgg really needs to re-train their order fulfillment staff to properly cushion shock-sensitive product on ALL SIX SIDES of the ... MoreBought this 2TB WD Black on it's reputation, previous experience, and 5 year warranty. I've had many of these over the years, and all have well outlived their manufacturer warranty period. That said, it appears that WD may have given up on protecting the reputation of their HDD's, as they slowly move over to the SSD business. The drive arrived quick from NewEgg, packed in the usual, sloppy manner: in the bottom of a box, with no cushioning on the bottom, all cushioning was on the sides and top. That said, I doubt that rough handling in shipment caused this issue, however- as the box was perfectly intact upon arrival...this time, anyway...NewEgg really needs to re-train their order fulfillment staff to properly cushion shock-sensitive product on ALL SIX SIDES of the package...It's really not asking much... I powered up the drive, formatted it, and on the very first spindown, it was apparent that the bearings were not healthy. It makes a noise that is a combination of a loud whine, with some grind to it- sounds just like a dying cow. Unfortunately, after doing some quick research on the internet, it appears that for the past six months or so, a lot of people have been receiving drives that exhibit this horrible noise on spindown, and WD has not commented on it as of yet... The noise is the sound of a slow death, and I'm not keeping it. I have opened an RMA with NewEgg, and will be sending it back for replacement immediately. I will allow just one chance here for them to send a good, non defective brand new replacement drive- but if the new one arrives and has any issues whatsoever, I'll be asking for my money back, as I don't have time to play the RMA shuffle until I get a good one. Sadly, it seems that the quality of the HDD product at WD isn't what it used to be. I do understand that occasional defects can happen, but after reading of so many other people encountering this same "dead cow" noise on spindown- I'm afraid that this may spell the end of the good HDD's. If SSD in a 2TB size were less expensive, I wouldn't even be thinking of getting a replacement for this thing, but the pricing on those is still extortive at this point, so.... ,,,,,,,,,,,,,,,,,,,,,_ EDIT: I received the replacement drive today (2018-01-16). Defective right out of the box. Makes the same whining, grinding, dying cow noise that the last drive made on spindown, like the bearing is damaged or the platter is out of balance. At this point, I can only assume that WD is moving out whatever junk parts they have left on the shelf, in preparation to move solely to the SSD market. I'm on hold now so I can get a return shipping label or call tag, and a refund. I'm not doing this over and over again until I finally get a working drive. I'm done...
So my son who is an avid PC gamer. His PC prior to this purchase had a 1TB Intel 660P NVME drive for OS and apps/games and a 1TB WD Blue mechanical drive. Of course, he also installed games on the WD Blue drive and is always out of space. He wanted something with more storage and I cautiously recommended the WD Black 6TB drive base don name, hopefully quality and reliability associated with the WD brand and of course the performance that WD Black implies. Pricing wise, not sure if I got a good deal or not. I suspect these drives are drying up because I do not believe they are actively being manufactured anymore. All that being said, installation was straightforward. Was proud of myself for cloning the 1TB mechanical WD Blue drive to the WD Black and then using tools ... MoreSo my son who is an avid PC gamer. His PC prior to this purchase had a 1TB Intel 660P NVME drive for OS and apps/games and a 1TB WD Blue mechanical drive. Of course, he also installed games on the WD Blue drive and is always out of space. He wanted something with more storage and I cautiously recommended the WD Black 6TB drive base don name, hopefully quality and reliability associated with the WD brand and of course the performance that WD Black implies. Pricing wise, not sure if I got a good deal or not. I suspect these drives are drying up because I do not believe they are actively being manufactured anymore. All that being said, installation was straightforward. Was proud of myself for cloning the 1TB mechanical WD Blue drive to the WD Black and then using tools to convert the cloned image from MBR to GPT once it was laid back down on the Black drive and expand the partition to the full 5.35GB readable by Windows. After all said and done, everything just worked and all the game installs and other things on the new Black drive worked without incident. This drive does make a bit more "noise" than the Blue it replaced. I assume there are more platters in it and that they may be at a different spindle speed than the Blue drive it replaced. Anyway, drive noise just makes me nervous. Other reviews indicate that this drive runs warmer than other drives and while I cannot say one way or the other, I do worry about temperatures overall in the PC it is installed in. Paranoia aside that a spindle drive is doomed to fail out of the box, performance wise this drive does seem to perform well. Games that were installed on it, do launch quicker than when they were on the Blue. Another interesting observation. We are fortunate to have 1Gb FIOS internet. When downloading and installing games from Steam onto the Intel 660p, it doesn't take long for the write cache of the Intel 660p to saturate and write speeds drop to a crawl. However, when downloading games from Steam to the WD Black, the write speeds while downloading large games seems to be more consistent and maintain a higher median level. I suspect the write cache in the Black is larger and maybe managed better than the Intel 660p even though it is an NVME. Of course reviews for Intel 660p do suggest that it really does suffer when its write cache is saturated. Overall, my son is very happy with this drive. As long as it lasts and gives him good service, I am cautiously optimistic. I really do think that we need to get good quality consumer grade SSD/NVME drives at mechanical HDD prices if we want to drive PC storage forward. I would have loved to purchase a 2.5" form factor SSD of the same size but prices are just too high once you get beyond 2TB.
I bought this to convert movie files to folders of tif images. (tif images are basically bit maps that can hold movie color space. They're huge.) It is able to keep up with the image processing program I have that outputs to that. The other hard drive I was using could not keep up and would slow the whole thing down.I'm impressed with the capacity and ability of this drive compared to the price.I'm taking a star off because this drive disappears for about 15 seconds every hour or so. Everything that's using it freezes until it comes back. I doubt that's normal behavior, but since I'm only storing temporary data on it, and it always comes back, so I don't think it needs a replacement.I don't remember if this has RAM or what, but when writing to it, it can take ... MoreI bought this to convert movie files to folders of tif images. (tif images are basically bit maps that can hold movie color space. They're huge.) It is able to keep up with the image processing program I have that outputs to that. The other hard drive I was using could not keep up and would slow the whole thing down.I'm impressed with the capacity and ability of this drive compared to the price.I'm taking a star off because this drive disappears for about 15 seconds every hour or so. Everything that's using it freezes until it comes back. I doubt that's normal behavior, but since I'm only storing temporary data on it, and it always comes back, so I don't think it needs a replacement.I don't remember if this has RAM or what, but when writing to it, it can take about 5GB really fast. Then it slows down to about 160MB per second, plus or minus 10. For reference, gigabit ethernet caps at 115MB per second. (These are all numbers displayed by Windows OS.)
In this review, you will not find a bunch of bench tests and load tests. Just straight up real world feedback from your typical gamer. I was hoping to get 2 years out of this drive with regular gaming etc. I’ll update if it dies for any reason.I took this drive out, hooked it up in my PC (3060, 12400f, 16gb RAM) and did a quick format. Renamed it and started loading games. This was surprisingly quiet, I anticipated it to be a lot louder being a purpose-built gaming HDD. It’s really not much louder than the fans running at 70%. It’s an HDD so you’ll hear it spool up and click etc, but I’ve never had anyone say they can hear it through my mic or anything.Downloading/writing games was quick. I don’t believe server speed can beat out the write speed on this drive. ... MoreIn this review, you will not find a bunch of bench tests and load tests. Just straight up real world feedback from your typical gamer. I was hoping to get 2 years out of this drive with regular gaming etc. I’ll update if it dies for any reason.I took this drive out, hooked it up in my PC (3060, 12400f, 16gb RAM) and did a quick format. Renamed it and started loading games. This was surprisingly quiet, I anticipated it to be a lot louder being a purpose-built gaming HDD. It’s really not much louder than the fans running at 70%. It’s an HDD so you’ll hear it spool up and click etc, but I’ve never had anyone say they can hear it through my mic or anything.Downloading/writing games was quick. I don’t believe server speed can beat out the write speed on this drive. I’m running 1.2gbps up and down and I haven’t met a server that can get me a game at 10% of that. So no delays when downloading/writing.In use, it works extremely well. I’m using this for storage but I also play off the HDD. I keep my AAA titles on an SSD (WZ2 etc.) and really only have MSFS2020 as far as heavy load games on this. Honestly, it doesn’t load MSFS any slower than an SSD. Same goes for Snowrunner. They load right up and there are no issues playing through this HDD, and I play MSFS on very high/ultra. Sometimes the GPU struggles but the HDD does not.Overall, I would highly recommend this to any casual-intermediate PC gamer, ESPECIALLY if you plan to play through the HDD. If you’re running a 4090ti and 13900K, maybe put your games on an SSD (you can afford it) but this drive has done everything I’ve asked of it.Again, if anything changes I’ll update but for now, I’m glad I ponied up the extra coin for this drive over a lesser unit.
For Hard Drives, it's kind of difficult to rate until we've had them long term, to see if they're going to fail or not. I've only had mine a few months at the time of this review, but so far, so good!It's been very fast, and mostly quiet as far as these kind of drives go, and was a decent price for the amount of storage. It was easy to install and just what my new system was missing.I use the more expensive Solid State Drives for boot up and some of my main files, but I use this to hold all my general storage. That's worked out great so far, and the game performance on it is pretty nice.It gets very high marks on benchmarks for this type of drive. All will be well as long as it holds up. Only time will tell there.
I bought 2 6TB Black 3.5 inch hard drives directly from WD on March 9 2022. The website tracking is broken, it never showed these shipping, but a week later a small, (flimsy, falling apart, partially broken open) box arrived containing my hard drives. The drives were packed with no cushioning on the top or bottom and the cheap bubble wrap surrounding the drives was popped open. This terrible packing was very disappointing, but I hoped for the best... bad sadly the drives were either defective to start with (and WD knew it which is why the shipped like this) or they were damaged during shipping. One drive would not initialize, the other started but made a loud clanking noise/defective. I do not understand why anyone would pack sensitive electronic equipment like hard ... MoreI bought 2 6TB Black 3.5 inch hard drives directly from WD on March 9 2022. The website tracking is broken, it never showed these shipping, but a week later a small, (flimsy, falling apart, partially broken open) box arrived containing my hard drives. The drives were packed with no cushioning on the top or bottom and the cheap bubble wrap surrounding the drives was popped open. This terrible packing was very disappointing, but I hoped for the best... bad sadly the drives were either defective to start with (and WD knew it which is why the shipped like this) or they were damaged during shipping. One drive would not initialize, the other started but made a loud clanking noise/defective. I do not understand why anyone would pack sensitive electronic equipment like hard drives with no protection, unless they knew they were defective to start with and hoped I would not test them, put them on a shelf for later. I contacted what turned out to be the worst customer service from a large corporation ever. I tried the phone and email and all they ever said was "give us 2-3 day to look in to this". I did that for a week... WD showed they do not care/know the drives were bad to start with forcing me to open a paypal dispute to get my money back. I was stunned when WD had 14 days to reply... but NEVER replied to the dispute. At the end of the time limit paypal closed the case and refunded my money. It took me almost a month to get my money back. WD should be ashamed. I have purchased 20-25 hard drives over time from WD, and I guess I got lucky and worked... but every relationship is good until there is an issue.... then we see what is real..... WD is not real. WD is a terrible company in every department. I am disgusted at WD and I will never do business with Western Digital again.
This is the hottest (temperature) hard drive I have ever used. I am a programmer for a fortune 500 company. I have dealt with thousands of hard drive, SSDs, and NVME. This is the hottest drive I ever dealt with. You cannot touch it. I have left the side off my just built own PC because I don't know if my cooling solution(s) can handle the extra calories of heat.
I bought one of these to replace boot drive in aging HP desktop. The transition went well even after I realized I could not use more than 2TB because of my ancient motherboard. After a couple of days I realized that boot up was faster and that response for virtually everything was faster- did not expect that. So I ordered another. It arrived promptly; but was dead out of box. WD gave me a return form and refunded it promptly after receipt. I bought another and put it in the case. I added another fan to increase ventilation and everything is humming along nicely. WD has always been my favorite storage source.
As my computer's internal storage grows, I need larger backup drives. The Black series WD drives are great for that purpose. Over time, I put the smaller drives inside my computer case and as the prices go down, I buy larger backup drives. These drives are great for making forensics clones/copies as well.
I am a system builder. I have been using WD drives for over 15 years in all my systems and builds I do for clients, and I have never once had a WD drive die on me, nor have any of my clients from the past 8 years reported dead drives to me. I have tried Seagate drives, and had multiple drives fail on me or show signs of failure. For SSD drives, Samsung is my first choice to go to if it is in the budget. Western Digital is next for more of a budget friendly system. I have never had any issues with their drives, and the WD Dashboard app gives all the data and info you need for both WD HDDs and SSDs. These 6TB black drives are some of the best for standard consumer performance hard drives on the market. They have solid read and write times, and these new ones run a lot ... MoreI am a system builder. I have been using WD drives for over 15 years in all my systems and builds I do for clients, and I have never once had a WD drive die on me, nor have any of my clients from the past 8 years reported dead drives to me. I have tried Seagate drives, and had multiple drives fail on me or show signs of failure. For SSD drives, Samsung is my first choice to go to if it is in the budget. Western Digital is next for more of a budget friendly system. I have never had any issues with their drives, and the WD Dashboard app gives all the data and info you need for both WD HDDs and SSDs. These 6TB black drives are some of the best for standard consumer performance hard drives on the market. They have solid read and write times, and these new ones run a lot more quiet then some of the WD black drives I have purchased in the past. I do a lot of video editing and capturing. With BlackMagic Design Disk speed test app, I get an average write time of 250.6 MB/s and a read time of 241.2 MB/s when doing a 5gig stress test. So far, every WD drive, including these 6tb Black drives have been great. I purchased two of them on this order. I did full formats on them and then tested them for bad sectors. No errors, no issues. Been running them for a couple weeks now. Solid drives!
