Re: Harddisks and Patitions - Mappings: Win <-> Cygwin

[Eric Blake <eblake at redhat dot com>]

On 11/03/2010 10:35 AM, Thomas Jung wrote:
> Hello,
> 
> is there a file or something where I can see how cygwin
> maps the harddisks in windows to the usual unix style devices?
> 
> e.g. I can use:
> 
> dd if=/dev/sdb of=E:\hd1backup.bin bs=4096
> 
> to backup the whole second harddrive or just
> partitions of that disk if I use if=/dev/sdbX

That won't do what you think.  You probably want:

dd if=/dev/sdb of=/cygdrive/e/hd1backup.bin bs=4096

Since dd open()ing the output file using a DOS filename won't
necessarily use the correct binary mode settings that you want.

> 
> But I can't be sure if that cygwin/unix styled device
> names are the partitions which I think.
> 
> Where are such "mappings" stored/saved/recorded?

Have you tried the latest snapshot?  According to
https://bugzilla.redhat.com/show_bug.cgi?id=649310

cygwin 1.7.8 (and current snapshots) add the ability to do tricks like:

>   $ cygpath -w /dev/sda1
>   \\.\C:
>   $ cygpath -w /proc/sys/Device/CdRom0
>   \\.\D:

as a way of validating that you have selected the correct raw device.

-- 
Eric Blake   eblake@redhat.com    +1-801-349-2682
Libvirt virtualization library http://libvirt.org

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