Re: IDE and hot-swap disk caddies

Vojtech Pavlik (
Thu, 28 Mar 2002 00:53:39 +0100

On Wed, Mar 27, 2002 at 11:29:00PM +0100, Pavel Machek wrote:
> Hi!
> > > > You can paint a goose yellow and call it a duck, but it is still a goose.
> > > > The electrical/electronic interface will kill you!
> > >
> > > USB mass storage is not SCSI (in some cases), either. [Ouch, and some
> > > usb-storage devices *are* IDE.]
> > >
> > > So it makes sense to view IDE as very odd SCSI controllers.
> >
> > IDE is very different. Its like calling NFS Netware. The upper layer
> > behaviour is fairly similar, and both ATAPI and USB mass storage is SCSI
> > alike (note if its not SCSI like its not USB mass storage its something else
> > eg a vendor specific driver).
> I have seen USB mass storage devices with ide connector on them, so it
> is certainly possible to translate between scsi and ide. If it makes
> sense from performance standpoint.... I don't know.

That's between SCSI and ATAPI, which are mostly the same on command
level. ATA (IDE), which is used for harddrives is older, and different.

Vojtech Pavlik
SuSE Labs
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