Re: Detection of Advanced Format drives

[Mike Snitzer]

On Mon, Sep 26, 2011 at 3:48 PM, Joshua Scoggins
<theoretically.x64@xxxxxxxxx> wrote:
> Keep in mind that some AF drives will not report their actual sector
> sizes. I have this issue with the WD AV-25 series. This is to provide
> compatibility with older operating systems that don't support AF
> drives. These are called generation 1 devices. Newer drives will
> directly report their sector size as 4096 through the drive identify
> data older ones will say 512. At that point you just need to do a
> google search to see if it's AF or not.

Linux should publish the discrepancy with these <disk> specific sysfs files:

/sys/block/<disk>/queue/logical_block_size=512
/sys/block/<disk>/queue/physical_block_size=4096

But are you saying you have an AF disk that doesn't publish this
discrepancy via the IDENTIFY DEVICE (ATA) or READ CAPACITY 16 (SCSI)
command?
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/