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InvisibleRobo
R Series 66Y
Registered: 05/08/07
Posts: 14,861
SSD "Alignment" Linux/BSD ?
    #14274522 - 04/11/11 07:55 PM (12 years, 9 months ago)


Anyone that can shed some light on the subject? Especially Linux/*BSD users that currently use SSD, and have performed this. Apparently its a non-issue in Windows.



I bought an SSD for FreeBSD on a laptop, then find out about this whole mess. Now I'm stuck.  People on both the Arch and FreeBSD forums are using a similar "GPT" command line tool...but the man pages seem kinda lacking and there's no real "hand-holding" guides around, for people such as myself. :frown:


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OfflineSeussA
Error: divide byzero


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Registered: 04/27/01
Posts: 23,480
Loc: Caribbean
Last seen: 2 months, 21 days
Re: SSD "Alignment" Linux/BSD ? [Re: Robo]
    #14274589 - 04/11/11 08:09 PM (12 years, 9 months ago)

SSD Alignment refers to properly sizing your partitions to start on a multiple of the EBS (erase block size) of the SSD.  The EBS of each drive is manufacturer specific, so you need to look at the tech specification for your drive to find the EBS.  It will be something like 512, 1024, 2048, 4096, etc.  The larger the disk, the larger the EBS (most likely).

Once you know the EBS, you need to partition the disk so that each partition starts on a LBA (logical block address/sector) that is a multiple of the EBS.  If your EBS is 512, your first partition would start on LBA 512, or 1024 (or any other multiple of 512).

In Linux, I would use gptfdisk ... there are a lot of examples on how to use the tool.


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Offlinegrimm_reefer
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Registered: 04/16/11
Posts: 10
Last seen: 12 years, 9 months
Re: SSD "Alignment" Linux/BSD ? [Re: Seuss]
    #14305983 - 04/17/11 12:17 PM (12 years, 9 months ago)

thanks for the post. i havent actually got a SSD yet, but i was really considering it. may not worry about it though if it is too much hassle. price already is a big turn off


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InvisibleRobo
R Series 66Y
Registered: 05/08/07
Posts: 14,861
Re: SSD "Alignment" Linux/BSD ? [Re: Seuss]
    #14306106 - 04/17/11 12:36 PM (12 years, 9 months ago)

Yep thanks.  I got it figured out, now up and running!


Boot time is crazy.  :whoa:


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Offlinegrimm_reefer
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Registered: 04/16/11
Posts: 10
Last seen: 12 years, 9 months
Re: SSD "Alignment" Linux/BSD ? [Re: Robo]
    #14307612 - 04/17/11 05:02 PM (12 years, 9 months ago)

super fast?


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