SANDISK Optimus 5100 2TB vs Western Digital WD_BLACK SN8100 4TB SSD Comparison

SANDISK Optimus 5100 2TB and Western Digital WD_BLACK SN8100 4TB are both solid state drives with the same Form Factor (M.2-2280) and MTBF (1,750,000 hours). The main differences are in Capacity, Interface, Max Sequential Read and Max Sequential Write.

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SANDISK Optimus 5100 2TB	Western Digital WD_BLACK SN8100 4TB
Prices (Change region) In Stock $349.99 In Stock Free shipping $349.99	Prices (Change region) In Stock $659.99 Last updated 35 minutes ago. In Stock Free shipping $843.00 In Stock Free shipping $2,225.99
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Brand SanDisk	Brand Western Digital
Model SDSP51200TAN-000E0 SDSP51200TAN	Model WDS400T1X0M WDS400T1X0M-00CMT0
Release Date 📅 February 2026	Release Date 📅 May 2025
* First availability for purchase, it may not correspond to the actual market launch date.
User reviews Add a product review	User reviews Add a product review
Performance (Charts) n/a	Performance (Charts) 1st / 1748
Effective Value -	Effective Value 65th / 336
Price history View Details ►	Price history View Details ►
Price/GB $0.17	Price/GB $0.16
GB/$1 5.71	GB/$1 6.06
Series Optimus 5100	Series -
Capacity 2000 GB	Capacity 4000 GB
Interface PCIe Gen4 x4	Interface PCIe Gen5 x4
NVME Yes	NVME Yes
Form Factor M.2-2280	Form Factor M.2-2280
NAND Flash Type QLC 3D CBA NAND	NAND Flash Type -
Max Sequential Read Up to 7100 MB/s	Max Sequential Read Up to 14900 MB/s
Max Sequential Write Up to 6700 MB/s	Max Sequential Write Up to 14000 MB/s
MTBF 1,750,000 hours	MTBF 1,750,000 Hours