Re: tools support for non-512 byte sector sizes

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On Tue, 29 Jul 2008 13:24:31 -0400
Ric Wheeler <rwheeler@xxxxxxxxxx> wrote:

> 
> Jim pinged me about the use case for having our tool chain (parted 
> specifically) support devices with non-512 bytes sectors.
> 
> Off the top of my head, the following is the list of existing or soon to 
> appear devices that could use this (taken from our thread last year, at
> http://kerneltrap.org/mailarchive/linux-fsdevel/2007/3/11/317183):
> 
>     (1) R/W optical drives

Magneto opticals for years. 640MB M/O is 2K sector size. There are two
different partition table interpretations. One believes the table is 512
byte virtual sectors, the other believes the sectors are sectors. Welcome
to the PC nuthouse...


>     (2) S390 dasd devices have a 4096 byte sector
>     (3) new 4096 byte disks (which intend to export a virtual 512 byte 
> sector)

And which need a specific layout for performance - doubly so with raid
overlaid on it.

Also early SD type devices with 256 byte sectors simply don't work with
our scsi midlayer.

Alan
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