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X25-M allocation unit size

Forum Storage : General Storage - X25-M allocation unit size

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nates   07-08-2009 at 04:55:48 AM

For my Intel X25-M SSD, what should I use for the allocation unit size? I am using it for the OS, Windows 7. I know about performance vs efficient use of space, but specifically what is ideal for the X25-M? I tried very hard to find this info with Google, but couldn't. I'm guessing 4096 since no one is really talking about it. I found 4096 recommended for some OCZ drives.

I read that ideally the allocation size would match the block size. Does this make sense? What is the block size for the X25-M? It isn't in the data sheet from Intel.

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Lavarin   07-08-2009 at 08:27:45 AM
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Is there a reason why you have to manually set an allocation unit size? Windows should be able to make the best decision for you, when you ask it to format any kind of drive.

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nates   07-08-2009 at 12:50:29 PM
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I just like being sure the best decision is made. :)

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mindless728   07-08-2009 at 02:56:26 PM
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4k should be fine, but 16k is a little faster
http://communities.intel.com/message/22815
don't know how trusted it is

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nates   07-09-2009 at 06:50:15 AM
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Thanks mindless728. I'm surprised there isn't more info out there.

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stickittoem   10-15-2009 at 02:38:10 AM
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The "default" allocation under windows is always the same (at least up through vista, don't know about 7). It doesn't even try to figure out what's best for your drive - it'd treat ssd/hard disk the same. so that's a bad idea

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sminlal   10-15-2009 at 05:16:27 AM
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The X-25M G1 drives had a page size of 4K bytes (smallest data size that you can read or write), and a block size of 512Kbytes (smallest amount of data that can be erased). I believe the G2 drives are the same.

See: http://www.anandtech.com/cpuchipse [...] i=3403&p=3

The default NTFS cluster size for disks larger than 2GB is 4K bytes, which is a good fit for the X25M.


Message edited by sminlal on 10-15-2009 at 05:18:53 AM
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