On Friday 26 November 2004 07:08, Rahul Sundaram wrote:
> Hi
>
> > I plug in USB camera. Shos up at /dev/sda.
> > I add USB drive. Shows up at /dev/sdb.
> >
> > Tomorrow
> > I plug in USB drive. Shows up at /dev/sda
> > I plug in USB camera. Shows up at /dev/sdb.
> >
> > What if I have _two_ USB drives (I do - one for carrying stuff, one for
> > backups)?.
>
> afaik Udev has persistent naming. are you sure that doesnt solve your
> problem?
This is a plugging sequence on Nahant:
root@thylacine ~]# /sbin/fdisk -l /dev/sda
Disk /dev/sda: 40.0 GB, 40007761920 bytes
64 heads, 32 sectors/track, 38154 cylinders
Units = cylinders of 2048 * 512 = 1048576 bytes
Device Boot Start End Blocks Id System
/dev/sda1 1 38154 39069680 83 Linux
[root@thylacine ~]# /sbin/fdisk -l /dev/sdb
[root@thylacine ~]# /sbin/fdisk -l /dev/sdb
Disk /dev/sdb: 125 MB, 125960192 bytes
8 heads, 32 sectors/track, 961 cylinders
Units = cylinders of 256 * 512 = 131072 bytes
Device Boot Start End Blocks Id System
/dev/sdb1 * 1 961 122959+ 6 FAT16
[root@thylacine ~]# /sbin/fdisk -l /dev/sdb
[root@thylacine ~]# /sbin/fdisk -l /dev/sda
[root@thylacine ~]# /sbin/fdisk -l /dev/sda
Disk /dev/sda: 125 MB, 125960192 bytes
8 heads, 32 sectors/track, 961 cylinders
Units = cylinders of 256 * 512 = 131072 bytes
Device Boot Start End Blocks Id System
/dev/sda1 * 1 961 122959+ 6 FAT16
[root@thylacine ~]# /sbin/fdisk -l /dev/sdb
Disk /dev/sdb: 40.0 GB, 40007761920 bytes
64 heads, 32 sectors/track, 38154 cylinders
Units = cylinders of 2048 * 512 = 1048576 bytes
Device Boot Start End Blocks Id System
/dev/sdb1 1 38154 39069680 83 Linux
[root@thylacine ~]#
Note the drives changed as I predicted.
One one of my boxes consecutive pluggings of the camera have it moving
over /dev/sd{a,b,c,d} etc in rotation unless I use the eject command.
--
Cheers
John
