Write bottleneck encountered in SSD benchmarks

andy318

Junior Member
Sep 1, 2006
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I just got a Samsung PB22-J drive with the latest VBM19D1Q firmware. In different benchmark programs, sequential read speed approaches the value in the specification (220MB/sec) but write speed is much lower than the specified 200MB/sec.
Take a look at the ATTO benchmark screenshot, seems like there is some bottleneck which is slowing down the writes. Any ideas, anyone?

ATTO Benchmark
 

pjkenned

Senior member
Jan 14, 2008
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www.servethehome.com
That may just be the write speed of the drive. Typically drives have lower write speeds than read speeds. 50MB/s off on one benchmark is pretty big, but not unheard of. I've seen HD Tune and ATTO differ by 200-300 MB/s (that's difference mind you) on 8 drive Raid 5 arrays.
 

andy318

Junior Member
Sep 1, 2006
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Not sure how fragmentation would affect write time because SSD does not really get affected by it. If you mean, that a used drive will have slower writes because an erase needs to be done first, then it shouldn't apply in this case because the drive is brand new and the firmware it comes with (VBM19D1Q) supports TRIM. I'm running Windows 7 and ran the "fsutil behavior query disabledeletenotify" command and it returned the value to indicate that TRIM is supported