Re: DVD "backup" trouble

["Thomas Schmitt" <scdbackup@gmx.net>]

Hi,

Reco wrote:
> sr0                            11:0    1   3.9G  0 rom
> pktcdvd0                      252:0    1   1.2G  0 disk

The pktcdvd driver is of help only with operating a rw-filesystem on
formatted CD-RW (miserably slow) or formatted DVD-RW (annoyingly slow).


> Media summary: 1 session, 2042848 data blocks, 3990m data,     0 free
> sr0                            11:0    1     2G  0 rom
> I feel cheated :(

I am wondering how this misperception can happen.

Probably the info comes from function blkdev_get_size() in
  https://sources.debian.org/src/util-linux/2.34-0.1/lib/blkdev.c/?hl=102#L83
which looks like
  ioctl(fd, BLKGETSIZE64, bytes)
is the call which does the trick.

(Cute:
   https://sources.debian.org/src/util-linux/2.34-0.1/libblkid/src/probe.c/?hl=815#L815
 provides a preventive workaround for the TAO CD Read-Ahead bug. Such a
 thing should sit in the kernel.
)


Have a nice day :)

Thomas