Compare Sabrent Rocket 5 4TB and WD_BLACK SN7100 4TB: prices, speeds, $/TB. Which to buy in May 2026? Full spec breakdown.
Sabrent Rocket 5 4TB vs WD_BLACK SN7100 4TB pits two different generations against each other at 4 TB. The question isn't which is faster on paper — that's settled — it's whether the bandwidth gap shows up in your specific workload.
Hardware-wise, the Sabrent Rocket 5 4TB runs on the Phison E26 — the first widely-deployed Gen 5 controller, capable but thermally demanding. The WD_BLACK SN7100 4TB pairs SanDisk's A101 controller, used in newer WD_BLACK SKUs after the SanDisk spinoff.
Price separates these two meaningfully. The WD_BLACK SN7100 4TB costs $79.75/TB versus $184.75/TB for the Sabrent Rocket 5 4TB — a 57% premium that needs justification in real benchmarks, not just spec-sheet bragging.
Read speeds favor the Sabrent Rocket 5 4TB: 14,000 MB/s versus 7,000 MB/s for the WD_BLACK SN7100 4TB, a 50% advantage. Sequential-heavy workloads notice; transactional workloads don't.
The Sabrent Rocket 5 4TB writes about 42% faster (11,600 MB/s vs 6,700 MB/s). Whether that matters depends entirely on what you write to the drive — gameplay capture and large project saves benefit, browsing and gaming do not.
The Sabrent Rocket 5 4TB carries a dedicated DRAM chip for FTL (Flash Translation Layer) mapping; the WD_BLACK SN7100 4TB relies on HMB (Host Memory Buffer), borrowing 64 MB from system RAM. The practical gap shows up only under sustained random write loads.
Heading to a PlayStation 5? Both drives drop into the console's M.2 bay and report identical real-world benchmarks since the PS5 caps storage at PCIe 4.0 speeds. The WD_BLACK SN7100 4TB wins this matchup on $/TB. The leap from Gen 4 to Gen 5 doubles peak throughput on paper but produces single-digit-percent improvements in game load times, OS boot, and most productivity benchmarks. The WD_BLACK SN7100 4TB is the better default unless you have a specific workload that needs the extra lanes. Heavy write workloads — video editing, RAW photo libraries, backup operations — favor the Sabrent Rocket 5 4TB's 11,600 MB/s sustained write speed. Both drives use the 2280 form factor, which is too long for Steam Deck or ROG Ally — you'd need a 2230 variant if either manufacturer offers one, or a dedicated handheld-format drive instead.
Pick the Sabrent Rocket 5 4TB if you value meaningfully faster reads (14,000 MB/s), higher sustained writes (11,600 MB/s), and a dedicated DRAM cache chip. Sabrent extends Rocket warranties to 5 years through manufacturer registration and ships with the latest Phison firmware revisions, often ahead of competitors.
Pick the WD_BLACK SN7100 4TB if you value the lower retail price ($319 vs $739), and better $/TB economics ($79.75/TB).