Re: [PATCH] RESEND: SCSI, libata: add support for ATA_16 commands to libata ATAPI devices

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Jeff Garzik wrote:
> Mark Lord wrote:
>> For example, I think all existing ATAPI drives only speak 12-byte packet
>> protocols, and so if we tell SCSI we're good for 16-byte, then won't the
>> SCSI layer suddenly start sending us READ_16 and the like?
> 
> Speaking strictly about the device, IDENTIFY PACKET DEVICE data page
> tells us whether the device supports 12-byte or 16-byte CDBs.  No need
> to guess.
> 
> Some host controllers only support 12-byte, but I think that most should
> support 16-byte.

Out of curiosity, does ATA controllers which don't allow 16byte CDB
actually exist?  It's transferred using PIO protocol anyway.

-- 
tejun
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