cloning a boot partition

karlp at karlp at
Tue Jun 21 17:13:19 UTC 2005

> karlp at wrote:
>>>On 6/16/05, Mark Knecht <markknecht at> wrote:
>>>>just unpacked a little EIDE to USB adapter device that is supposed to
>>>>allow me to attach a raw EDIE drive to the system as a USB drive.
>>>>(We'll see if it works in 20 minutes!) ;-) Anyway, I expect that the
>>>>EIDE drive will be /dev/hda and the USB drive with be /dev/sda. Would
>>>>something like this work?
>>>>dd if=/dev/hda of=/dev/sda
>>>Unfortunately it appears that this little USB to EIDE adapter I got
>>>from Newegg doesn't work. (Or the drive is bad which seems unlikely)
>> It appears to me that the issue is USB 2.0, which probably isn't
>> backward
>> compatible to USB 1.1, which I'd bet you need in order to get it to
>> work.
> Uh, USB2.0 will run USB1.1 devices if that's what you mean.  Note that
> olders computers can't boot USB devices unless a BIOS update has been
> performed.  Also, USB hard disks show up as SCSI (just like just about
> everything else that isn't IDE/EIDE/ATA).

I beg to differ. Here at work, we install quite a few USB devices and have
too many problems installing USB2.0 devices on PCs with USB1.1
ports/drivers. Yes, USB2.0 is backward compatible, however, USB1.1 isn't
forward compatible and on drives we've installed that are addressed to
USB2.0 and larger than about 64MB addressable memory, we have significant
problems. Of course, I'm talking USB Thumb drives, which we use to backup
a very specialized Access DB for our application. My 2 bits (for
international folks, 2 bits represents .25 US dollar. There used to be a
12.5 cent piece in the U.S. back in the 1800s)


> ----------------------------------------------------------------------
> - Rick Stevens, Senior Systems Engineer     rstevens at -
> - VitalStream, Inc.              -
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