[Coco] SuperIDE backup/restore

[Luis Antoniosi (CoCoDemus)]

Mark,

I tried sudo dd of=/dev/sdb and it wans't working. Once is written it
destroys all the partitions but superIDE was unable to boot on it. Only
after deleting all partitions and writing over a non-allocated partition
that worked for me.



On Sun, Jul 28, 2013 at 11:31 PM, Mark McDougall <msmcdoug at iinet.net.au>wrote:

> On 29/07/2013 11:21 AM, Retro Canada wrote:
>
>  looks like the cf ide firmware plays dirty when there is a partition on
>> it. superide relays on sector count only, while the pc could use head
>> cylinder geometry.
>>
>
> That doesn't make sense to me. A 'partition' on an IDE drive is a high
> level concept that has no meaning in the ATA specification. CF card
> firmware has no knowledge of any such thing, which after all is simply
> sector data interpreted a certain way by PC BIOS's and OS's.
>
> In your second comment you could have a valid point, but it is totally
> unrelated to the first.
>
>  my very own experience since i recently purchased a cf card: i tried
>> everything and it wasn't working until i reformated and deleted  all
>> partitions in linux then write to the device since there is no partition
>> with sudo dd of=/dev/sdb
>>
>
> Any version of dd *should* treat the device as a raw block device. Under
> linux this is certainly the case, but the win32 'dd' is to a degree at the
> mercy of the Windows OS and I wouldn't be surprised if there was some
> munging going on that breaks certain rules.
>
> Indeed windows XP didn't support partitions at all on removable devices,
> and you had to run proprietary software in the early days to get around
> that problem. With the advent of USB sticks that changed, though I'm not
> intimately familiar with the exact details, but IIRC some of them simply
> didn't report themselves as removable devices.
>
> Regardless of any of the above, using dd under linux to read an image from
> the source CF and write to the destination CF should produce an exact copy
> regardless of the contents of the latter prior to the operation. dd (linux)
> uses raw device geometry which again knows nothing of 'partitions'.
>
> Regards,
>
> --
> |              Mark McDougall                | "Electrical Engineers do it
> |  <http://members.iinet.net.au/~**msmcdoug<http://members.iinet.net.au/~msmcdoug>>
>   |   with less resistance!"
>
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