cloning a boot partition

Rick Stevens rstevens at vitalstream.com
Tue Jun 21 17:25:50 UTC 2005


karlp at ourldsfamily.com wrote:
>>karlp at ourldsfamily.com wrote:
>>
>>>>On 6/16/05, Mark Knecht <markknecht at gmail.com> wrote:
>>>>
>>>>
>>>>>I've
>>>>>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)
>>>
>>>>http://www.newegg.com/Product/Product.asp?Item=N82E16812156001
>>>
>>>
>>>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.

If you read what I wrote, I said "USB2.0 will run USB1.1 devices".  I
said nothing about 1.1 running 2.0 devices, which it obviously can't.
----------------------------------------------------------------------
- Rick Stevens, Senior Systems Engineer     rstevens at vitalstream.com -
- VitalStream, Inc.                       http://www.vitalstream.com -
-                                                                    -
-   To err is human.  To forgive, a large sum of money is needed.    -
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