Hi all. 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. :-[ [EMAIL PROTECTED] 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 :-) ~$ dvd+rw-mediainfo usage: dvd+rw-mediainfo /dev/dvd [EMAIL PROTECTED]:~$ 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 [EMAIL PROTECTED]/s [EMAIL PROTECTED]/s Speed Descriptor#1: 00/2298495 [EMAIL PROTECTED]/s [EMAIL PROTECTED]/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: formatted: 2297888*2048=4706074624 00h(800): 2297888*2048=4706074624 10h(10): 2297888*2048=4706074624 15h(10): 2297888*2048=4706074624 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 FABRICATED TOC: Track#1 : [EMAIL PROTECTED] Track#AA : [EMAIL PROTECTED] Multi-session Info: [EMAIL PROTECTED] READ CAPACITY: 2297888*2048=4706074624 -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
