From mboxrd@z Thu Jan  1 00:00:00 1970
From: Jeff Garzik <jeff@garzik.org>
Subject: Re: CHS to LBA mapping for SCSI 6/10/12/16 byte RW CDB
Date: Fri, 12 Mar 2010 08:21:24 -0500
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References: <9edb119c1003120346r34c1c145t2be07595f9b151c6@mail.gmail.com>
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To: amruth pattanada <amruth.vamadev@gmail.com>
Cc: linux-ide@vger.kernel.org, Tejun Heo <tj@kernel.org>

On 03/12/2010 06:46 AM, amruth pattanada wrote:
> Hi
> All
> I require clarification regarding how bytes are stored in scsi_rw
> Command Descriptor Block for READ_6/WRITE_6 commands. In the
> structures below addr is either defined as 3 bytes or 4 bytes or 8
> bytes.How does it correspond to CHS in ATA. I assume addr[0]=Cylinder,
> addr[1]=head and addr[2]=sectors.Is my assumption correct. How does it
> map if it is 4/8 bytes addr.Is 3 bytes addr corresponds to 24 bit LBA,
> then how do we map 48 bit LBA. All scsi CDB structures are below.Any
> inputs will be highly appreciated.

Use the source, Luke.

All the answers you seek, drivers/ata/libata-scsi.c has, Yoda says.

	Jeff