by se7entse7en » Wed Dec 22, 2010 7:28 pm
It was strange because when I first got the laptop it had the ssd rated at around 7.3 or so. I thought it odd that I'd suddently be getting 5.9... which is why I was thinking maybe it was defective or something.
However, after googling around a bit, I found out a few things that I thought I'd share in case others here might find it useful.
Before data can be written to an ssd drive the existing data must first be completely deleted. Deleting files through the OS (ie Windows) does not zero out the file contents but rather, merely frees up the location for further writing. On a new drive, there is no pre-existing data so nothing needs zeroing, therefore, the ssd's performance benchmarks are high. Having to zero out the pre-existing data before writing new data hinders performance.
Many drives and BIOS's support a TRIM feature which zeroes out the data as soon as it is deleted by the OS (as opposed to zeroing it out prior to writing). Although my SSD supports this feature, my BIOS does not (appear) to have this capability.
To test whether this is what I am experiencing, I created a large zip file and zeroed it (using PGP Shredder) and then I reran the WEI benchmark and found that my HD performance was bumped up from 5.9 to 6.7.
Sounds like there's nothing wrong with my drive. Phew.
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