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4TB WD_BLACK SN7100 PCIe Gen 4 NVMe M.2 2280 Internal SSD
$210
$270
22% off
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Update: This popular deal is still available.
Amazon has 4TB WD_BLACK SN7100 PCIe Gen 4 NVMe M.2 2280 Internal Solid State Drive (WDS400T4X0E) on sale for $209.99. Shipping is free.
Thanks to Deal Hunter phoinix for sharing this deal.
About this product:
Amazon has 4TB WD_BLACK SN7100 PCIe Gen 4 NVMe M.2 2280 Internal Solid State Drive (WDS400T4X0E) on sale for $209.99. Shipping is free.
Thanks to Deal Hunter phoinix for sharing this deal.
About this product:
- 4TB Storage Capacity
- M.2 2280 Form Factor
- NVMe PCIe 4.0 x4 Interface
- Sequential Read Speeds up to 7,250 MB/s
- Sequential Write Speeds up to 6,900 MB/s
- Endurance (TBW): 2400TB
- PCIe 3.0 and 2.0 Backward Compatible
- WD_BLACK Dashboard
- Windows 10 and Later Compatible
- 5-Year Limited Warranty
Editor's Notes
Written by powerfuldoppler | Staff- About this Store:
- Don't have Amazon Prime? Students can get a free 6-Month Amazon Prime trial with free 2-day shipping, unlimited video streaming & more.
- If you're not a student, there's also a free 1-Month Amazon Prime trial available.
- Additional Information:
- This offer is now $10 less than our popular front page deal from yesterday which earned over 35 thumbs up.
- Please see the original post for additional details and/or view the Wiki and forum comments for further helpful discussion if available.
Community Notes
About the Poster
Deal Details
Community Notes
About the Poster
Update: This popular deal is still available.
Amazon has 4TB WD_BLACK SN7100 PCIe Gen 4 NVMe M.2 2280 Internal Solid State Drive (WDS400T4X0E) on sale for $209.99. Shipping is free.
Thanks to Deal Hunter phoinix for sharing this deal.
About this product:
Amazon has 4TB WD_BLACK SN7100 PCIe Gen 4 NVMe M.2 2280 Internal Solid State Drive (WDS400T4X0E) on sale for $209.99. Shipping is free.
Thanks to Deal Hunter phoinix for sharing this deal.
About this product:
- 4TB Storage Capacity
- M.2 2280 Form Factor
- NVMe PCIe 4.0 x4 Interface
- Sequential Read Speeds up to 7,250 MB/s
- Sequential Write Speeds up to 6,900 MB/s
- Endurance (TBW): 2400TB
- PCIe 3.0 and 2.0 Backward Compatible
- WD_BLACK Dashboard
- Windows 10 and Later Compatible
- 5-Year Limited Warranty
Editor's Notes
Written by powerfuldoppler | Staff- About this Store:
- Don't have Amazon Prime? Students can get a free 6-Month Amazon Prime trial with free 2-day shipping, unlimited video streaming & more.
- If you're not a student, there's also a free 1-Month Amazon Prime trial available.
- Additional Information:
- This offer is now $10 less than our popular front page deal from yesterday which earned over 35 thumbs up.
- Please see the original post for additional details and/or view the Wiki and forum comments for further helpful discussion if available.
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79 Comments
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Using an SN7100 4TB with no issues in an OWC 1M2 enclosure. And a 2TB SN770 in another 1M2.
Not sure about "reduced performance". Relative to what? I don't think there's a good argument to be made for having DRAM cache on an NVMe drive in an external enclosure.
And its lack of DRAM is directly related to its low(er) power consumption.
The primary reason for DRAM OR the system memory utilized via HMB is for the storage of the L2P tables (Logical to Physical) which is a map for the controller translating the logical address to a physical address in the flash memory. If there is no DRAM and HMB isn't available, the controller will set aside some of the flash SRAM to store this information. SRAM is slower than DRAM or system memory (even over the PCIe bus) and it also increases a phenomenon called Write Amplification, which in simple terms, causes excessive writing to the SRAM during write operations.
My comment about reduced performance is not untrue. In the case mentioned, MacOS does not support HMB, which SN7100 utilizes, so the controller would use part of the available Flash Nand to keep the L2P tables. However, to your point, it is still a very fast disk, even in an external enclosure. So, I definitely should have included a statement that the user would likely not even notice the small performance difference.
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The primary reason for DRAM OR the system memory utilized via HMB is for the storage of the L2P tables (Logical to Physical) which is a map for the controller translating the logical address to a physical address in the flash memory. If there is no DRAM and HMB isn't available, the controller will set aside some of the flash SRAM to store this information. SRAM is slower than DRAM or system memory (even over the PCIe bus) and it also increases a phenomenon called Write Amplification, which in simple terms, causes excessive writing to the SRAM during write operations.
My comment about reduced performance is not untrue. In the case mentioned, MacOS does not support HMB, which SN7100 utilizes, so the controller would use part of the available Flash Nand to keep the L2P tables. However, to your point, it is still a very fast disk, even in an external enclosure. So, I definitely should have included a statement that the user would likely not even notice the small performance difference.
When you wrote SRAM, I think you meant NAND. SRAM is massively faster than both NAND and DRAM. It's what your CPU's on-chip cache is. SSD controllers also contain a tiny bit of SRAM, maybe on the order of a few MB. It is used for a variety of tasks, and when necessary, can store a very small portion of the FTL. ALL drives, whether they use DRAM/HMB or not, store a copy of the FTL/L2P in NAND. DRAM-less drives (especially when they can't use HMB) have to update the copy stored in NAND more frequently, thus the reason for the increased Write Amplification.
When you wrote SRAM, I think you meant NAND. SRAM is massively faster than both NAND and DRAM. It's what your CPU's on-chip cache is. SSD controllers also contain a tiny bit of SRAM, maybe on the order of a few MB. It is used for a variety of tasks, and when necessary, can store a very small portion of the FTL. ALL drives, whether they use DRAM/HMB or not, store a copy of the FTL/L2P in NAND. DRAM-less drives (especially when they can't use HMB) have to update the copy stored in NAND more frequently, thus the reason for the increased Write Amplification.
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Got this one. Some people are concerned about it being a DRAMless drive. It depends on what you do. I put it in my ROG Ally X and notice no difference in day-to-day use coming from Samsung 980 Pro (that has DRAM), other than lower temps and power consumption, and the WD is faster too. It's a good deal too, all-time low as far as I can tell.
Did you notice if this 4TB drive is single sided? I am putting one in a laptop, though I also have a ROG Ally X (SALUTE!) =)
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