Robert Hancock wrote:
Herbert Rosmanith wrote:
good day,
I have a question concerning sending arbitrary ATA commands to an USB
drive.
Currently, I have a particular application which sends special ATA
commands
to an IDE drive using IDE_TASKFILE. So far, this works pretty well.
But now I also have to support USB harddisks from the same company.
The USB harddisk uses the same set of ATA commands as the IDE harddisk,
well, at least that's what I suppose.
How do I send ATA commands to this USB drive? I suppose this would be
done via SG_IO (the drive is recognised by linux as usb-storage, of
course), but how exactly does this have to be done? I have already
used SG_IO before to send some MMC commands to cdvd-drives, but I
don't know how to send ATA (such as those from T13) commands with this
interface.
Short answer is you likely can't. The USB-to-IDE bridge pretty much
entirely hides the fact that it's an IDE drive behind it, from the
host's viewpoint it looks pretty much like SCSI. Maybe if you sent SCSI
commands to the device it would translate them into the correct ATA
commands, depending on what exactly you're doing, but that's entirely
dependent on the bridge chip in question and I would guess most of them
don't support such fancy operations.
AFAIK most are not really pure bridges, but really microcontrollers
running a tiny firmware. So there is a non-zero chance of there being
an 'ata passthrough' SCSI command.
I would try to the official ATA_12 and ATA_16 SCSI commands first, to
see if they do something useful.
Jeff
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
