Which is better, Samsung 9100 PRO 4TB or WD_BLACK SN7100 4TB? July 2026 side-by-side with prices, specs, and verdict.
Cross-generation comparisons reveal whether you're paying for peak speed or sustained value. Samsung 9100 PRO 4TB vs WD_BLACK SN7100 4TB at 4 TB is a perfect lens for that question.
Hardware-wise, the Samsung 9100 PRO 4TB runs on Samsung's Presto controller — built in-house to push V-NAND to its Gen 5 ceiling. The WD_BLACK SN7100 4TB pairs the SanDisk A101 — a more recent design from the WD/SanDisk lineup.
At a 37% price gap, the Samsung 9100 PRO 4TB needs to be measurably better in your specific use case to justify the spend. For gaming and general PC use, the WD_BLACK SN7100 4TB's lower $/TB tilts the value equation decisively in its favor.
On sequential reads the Samsung 9100 PRO 4TB pulls ahead by 7,800 MB/s (14,800 MB/s versus 7,000 MB/s). That matters for moving large files but rarely shows up in game loads.
Write speeds skew toward the Samsung 9100 PRO 4TB: 13,400 MB/s sustained against 6,700 MB/s. Content creators feel this; gamers do not.
Samsung 9100 PRO 4TB bundles a DRAM cache chip; WD_BLACK SN7100 4TB is DRAM-less. This sounds like a big deal but reviewers have been arguing for years about whether it actually matters in consumer use. For most workloads, no.
For PS5 expansion, both are PCIe Gen 4 M.2 2280 drives that meet Sony's minimum spec (7,000 MB/s read). The console can't take advantage of speeds beyond that, so save money by choosing the WD_BLACK SN7100 4TB. Generational difference matters mainly for sequential-heavy workloads. The Samsung 9100 PRO 4TB's 14,800 MB/s read beats WD_BLACK SN7100 4TB's 7,000 on paper, though in practice both feel identical loading games. Video editors will gravitate toward the Samsung 9100 PRO 4TB for its write headroom (13,400 MB/s sustained). Project saves and proxies move faster, which compounds across a workday. Heads-up — these are full-length 2280 drives. Steam Deck and most current handhelds require shorter 2230 modules, so check capacity-specific 2230 variants if that's your target platform.
Market context: the Samsung 9100 PRO 4TB ranks #5 of 6 Gen 5 4 TB drives we track by $/TB, while the WD_BLACK SN7100 4TB ranks #5 of 6 Gen 4 4 TB drives. Neither is a value leader right now — if $/TB is your priority, check the cheaper alternatives below before committing.
As of July 27, 2026, these tracked drives undercut both the Samsung 9100 PRO 4TB and WD_BLACK SN7100 4TB on $/TB:
Lean toward the Samsung 9100 PRO 4TB when meaningfully faster reads (14,800 MB/s), higher sustained writes (13,400 MB/s), and a dedicated DRAM cache chip top your priority list. Samsung backs the PRO series with one of the strongest warranty experiences in consumer storage — RMAs typically process within 5 business days globally.
Lean toward the WD_BLACK SN7100 4TB when the lower retail price ($570 vs $898), and better $/TB economics ($142.50/TB) top your priority list.