How to "unlock" a CDRW disc?
I have a CD-RW disc that I use to test combo drives; I put it in the drive, erase it and burn something to it to make sure the drive is working. Suddenly I can't erase it. I put it in the drive, opened Disk Utility, selected the disc, clicked erase, and got a message: "Optical Erase failed with the error: Optical Erase Failed." Not very informative.
So I tried erasing the disc with Toast, which informed me:
The drive reported an error:
Sense Key = ILLEGAL REQUEST
Sense Code = 0x30, 0x05
CANNOT WRITE MEDIUM - INCOMPATIBLE FORMAT
Toast Lite told me:
The drive reported an error:
Sense Key = ILLEGAL REQUEST
Sense Code =0x27
WRITE PROTECTED
Toast Lite in OS 9 said the same.
I tried my own computer (known good SuperDrive), with the same results. I inserted a recorded CD-R disc, but this time the "Erase" button in Disk Utility was not live, and Toast told me "Only CD-RW media can be erased." So apparently the utilities see the CD-RW disc as RW, i.e. erasable, but then also see it as somehow "write protected" -- as if it were a floppy disk that's been write-protected by sliding the tab to open the hole. But there's no tab or whole on this CDRW disc, and I can't see any bit to switch in Get Info.
I've used this CDRW disc (erased it and burned a few items to it) maybe a dozen times; I don't have much experience with this technology, but understand RW discs are supposed to be usable some thousands of times at least. Is there some way it could have been "locked" so it cannot be erased again? How can I unlock it? Anyone have any suggestions?
So I tried erasing the disc with Toast, which informed me:
The drive reported an error:
Sense Key = ILLEGAL REQUEST
Sense Code = 0x30, 0x05
CANNOT WRITE MEDIUM - INCOMPATIBLE FORMAT
Toast Lite told me:
The drive reported an error:
Sense Key = ILLEGAL REQUEST
Sense Code =0x27
WRITE PROTECTED
Toast Lite in OS 9 said the same.
I tried my own computer (known good SuperDrive), with the same results. I inserted a recorded CD-R disc, but this time the "Erase" button in Disk Utility was not live, and Toast told me "Only CD-RW media can be erased." So apparently the utilities see the CD-RW disc as RW, i.e. erasable, but then also see it as somehow "write protected" -- as if it were a floppy disk that's been write-protected by sliding the tab to open the hole. But there's no tab or whole on this CDRW disc, and I can't see any bit to switch in Get Info.
I've used this CDRW disc (erased it and burned a few items to it) maybe a dozen times; I don't have much experience with this technology, but understand RW discs are supposed to be usable some thousands of times at least. Is there some way it could have been "locked" so it cannot be erased again? How can I unlock it? Anyone have any suggestions?
