Hi,

Gdsi Gdsi wrote:
> After `dd if=/dev/null of=/file.iso',

For what purpose did you do this ?
It is supposed to let "/file.iso" grow until the root filesystem is full.


> Device        Start      End Sectors  Size Type
> /dev/sdb1      2048  4196351 4194304    2G Linux filesystem
> ...
> root@debian:~# mount -v  /dev/sdb /mnt
> mount: wrong fs type, bad option, bad superblock on /dev/sdb,

As already mentioned by Pol Hallen, you should try to mount /dev/sdb1,
not /dev/sdb.

/dev/sdb is the whole device.
Partition /dev/sdb1 begins 1 MiB after the start of the device.


Have a nice day :)

Thomas

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