Tom’s Hardware measured about 4 GB/s of sustained writes for an hour on its 1.92TB Sandisk NAS 800 sample after the drive’s brief cache phase. That makes it a compelling fit for some long-write NAS jobs, but not an automatic pick for everyday PC transfers: the same review found weaker results in a 50GB file workload and reported that the drive lacks hardware power-loss protection. Tom’s Hardware’s test results
What the NAS 800 does after its cache fills
In Tom’s Hardware’s sequential-write testing, the sample reached about 12 GB/s for roughly one second in pSLC mode, then dropped to just under 4 GB/s while writing directly to TLC flash. In a separate sustained test, it held about 4 GB/s for an hour. pSLC is a small, faster cache that temporarily stores writes; once it fills, direct-to-TLC writing continues at a lower rate.
That result is distinct from Sandisk’s advertised maximum of up to 13,200 MB/s sequential writes for the 1.92TB model. A maximum specification describes a rated peak, not the hour-long result measured in a particular test. Sandisk also rates this model for sequential reads of up to 14,900 MB/s. Sandisk’s specifications for the NAS 800
Why a 50GB file test gives a different result
Tom’s Hardware’s DiskBench workload used a custom 50GB dataset containing 31,227 files. The small cache absorbed about the first quarter of the write. In that test, the NAS 800’s write performance was about 20% behind other Gen 5 drives, while copying was 36% behind the WD Black SN8100 tested on the same hardware.
Those results describe that workload, not every NAS transfer. Tom’s Hardware said the 50GB pattern works against the NAS 800’s sustained-write design and that a larger transfer would better show steady-state performance. The distinction matters: short-to-medium file jobs put more weight on burst behavior, while a long sequential write gives the drive more time to settle into its post-cache rate.
The review also found the NAS 800 behind the WD Black SN8100 by 26% in PCMark 10 and 21% in 3DMark Storage. Tom’s Hardware described its PCMark 10 performance as well above Gen 4 drives, but said it would not be its first choice for general applications. Its CrystalDiskMark results were much stronger for low-queue-depth random latency, including 4KB operations. Tom’s Hardware’s benchmark results
Endurance, warranty, and power-loss protection
For the 1.92TB model, Sandisk specifies 3,500 TBW and a five-year limited warranty. TBW means terabytes written; Sandisk says its endurance ratings use the JEDEC client workload JESD219. The rating is a useful point of comparison for write-heavy storage, but it is not a promise that every drive will last for a particular number of years. Sandisk’s NAS 800 specifications
Tom’s Hardware identified the reviewed sample’s controller as Silicon Motion SM2508, alongside 2GB of LPDDR4 DRAM and 218-layer BiCS8 TLC flash. These are findings from its inspection of that sample. The review also reported that the NAS 800 lacks hardware for power-loss protection, such as an array of capacitors. Buyers who need that specific hardware feature can consider the Addlink NAS D60, which Tom’s Hardware identifies as an alternative that has it. Tom’s Hardware’s inspection and feature findings
Temperature and workload fit
In Tom’s Hardware’s temperature test, conducted at about 22°C ambient, the sample peaked below 70°C and did not overheat. The review still found its power efficiency below the WD Black SN850X and described it as underwhelming by Gen 4 and Gen 5 standards. That is a separate drawback from the thermal result.
The NAS 800 makes the most sense when a workload can use sustained write bandwidth and the 1.92TB model’s endurance rating is worth the premium. For many NAS applications that do not need its bandwidth or endurance, Tom’s Hardware says Gen 4 drives are viable alternatives. For mixed desktop use, its weaker results against the WD Black SN8100 in the cited PC benchmarks are a reason to look beyond the sequential-write maximum.
U.S. review-time price
Tom’s Hardware listed the 1.92TB Sandisk NAS 800 at $699.99 in its October 2026 review. That is the review-time U.S. listing, not a guaranteed current offer. Tom’s Hardware’s review
