Partition Alignment

chooky Sep 28, 2009 6:42 PM

I have a Intel X25-M SSDSA2MH080G2C1 2.5" 80GB. I believe partition alignment to the nand block size is important for performance on SSD's. What is the nand block size on this drive? How can I check that the partition is aligned properly?

Thanks

1. Re: Partition Alignment

GrandAdmiralThrawn Sep 29, 2009 3:14 AM (in response to chooky)

Hello!

The NAND erase blocks on Intel MLC drives are 128 pages wide. With each page being 4kB in size this results in a block size of 512kB. So, with either 0.5MB or the more widely used 1MB offset (Win7 etc.) your partitions will be aligned to the block size!
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2. Re: Partition Alignment

chooky Oct 1, 2009 7:40 PM (in response to GrandAdmiralThrawn)

Thanks for the reply. My partiton was misaligned as I had copied the partition to the SSDs with Acronis from a Dell PC which had a restore/utility partition. I fixed the alignment and got a good increase in performance as you can see.

Before
After
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