How to "blank" / "zero out" / "nullify" a dvd-rw?
I'm trying to "blank" / "zero out" / "nullify" a dvd-rw that has
previously had data written to it, so that I can give that dvd-rw to
someone else and they wont see the data. (NB I'm _not_ worried about
"magnetic/optical history", the FBI, the CIA etc).
Please note that I DO NOT necessarily want to turn the disk back to
the way it was when it was still in its plastic wrapper.
I've read at http://fy.chalmers.se/~appro/linux/DVD+RW/ that lots of
re-formatting can be bad for the disk, so the recommended way to
"blank" a dvd-rw is to use:
growisofs -Z /dev/hdc=/dev/zero
But this gives me the following error:
~# growisofs -Z /dev/hdc=/dev/zero
Executing 'builtin_dd if=/dev/zero of=/dev/hdc obs=32k seek=0'
/dev/hdc: "Current Write Speed" is 2.0x1352KBps.
:-[ WRITE@LBA=0h failed with SK=5h/ASC=30h/ACQ=05h]: Wrong medium type
:-( media is not formatted or unsupported.
:-( write failed: Wrong medium type
But (and this is the strange part), if I format the disk using
"dvd+rw-format -blank=full /dev/hdc" (which works), then "growisofs -Z
/dev/hdc=/dev/zero" works perfectly THE FIRST TIME - it only fails the
second time I try to do it.
Question - is my understanding wrong here? Should "growisofs -Z
/dev/hdc=/dev/zero" always work? If not, is there a way to "blank" /
"zero out" / "nullify" a dvd-rw which won't permanently destroy the
disk if I do it 20 times?
I've included the output from "dvd+rw-mediainfo /dev/hdc" at the end
of this mail, in case it helps. Thanks in advance, Jaime :-)
usage: dvd+rw-mediainfo /dev/dvd
nonroot@server:~$ dvd+rw-mediainfo /dev/hdc
INQUIRY: [PIONEER ][DVD-RW DVR-110D][1.22]
GET [CURRENT] CONFIGURATION:
Mounted Media: 14h, DVD-RW Sequential
Media ID: TDK502sakuM3
Current Write Speed: 2.0x1385=2770KB/s
Write Speed #0: 2.0x1385=2770KB/s
Write Speed #1: 1.0x1385=1385KB/s
Speed Descriptor#0: 00/2298495 R@2.0x1385=2770KB/s W@2.0x1385=2770KB/s
Speed Descriptor#1: 00/2298495 R@1.0x1385=1385KB/s W@1.0x1385=1385KB/s
READ DVD STRUCTURE[#10h]:
Media Book Type: 00h, DVD-ROM book [revision 0]
Legacy lead-out at: 2298496*2KB=4707319808
READ DVD STRUCTURE[#0h]:
Media Book Type: 32h, DVD-RW book [revision 2]
Last border-out at: 2045*2KB=4188160
READ DISC INFORMATION:
Disc status: complete
Number of Sessions: 1
State of Last Session: complete
Number of Tracks: 1
READ FORMAT CAPACITIES:
READ TRACK INFORMATION[#1]:
Track State: complete incremental
Track Start Address: 0*2KB
Free Blocks: 0*2KB
Track Size: 2297888*2KB
Last Recorded Address: 2297887*2KB
Track#1 : 14@0
Track#AA : 14@2297888
Multi-session Info: #1@0
READ CAPACITY: 2297888*2048=4706074624