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Re: [Xen-devel] bug when using 4K sectors?
- To: Keir Fraser <keir.xen@xxxxxxxxx>
- From: Alan Cox <alan@xxxxxxxxxxxxxxxxxxx>
- Date: Sun, 16 Sep 2012 12:27:04 +0100
- Cc: Joseph Glanville <joseph.glanville@xxxxxxxxxxxxxx>, James Harper <james.harper@xxxxxxxxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxx>, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
- Delivery-date: Sun, 16 Sep 2012 11:23:19 +0000
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- List-id: Xen developer discussion <xen-devel.lists.xen.org>
> I would kind of expect it to work, as CD-ROMs have a larger sector size (2kB
> IIRC) and we support those...
For data blocks they are 2K, as are some magneto-opticals.
The more complicated case is modern hard disks, while you can access them
on 512 byte boundaries they are actually using bigger block sizes but the
large blocks are not neccessarily on the 0 boundary in order to get
optimal alignment for existing file systems and partitioning.
So knowing the block size isn't the whole story.
Alan
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