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A used CD-RW recover  to a new CD-RW???

Posted on 2001-08-18
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Last Modified: 2010-04-13
We can backup a CD to a new CD-RW just like backup to a CD-R.

However, if a CD-RW has been used several times and then formatted, a CD can NOT backup to this formatted
CD-RW. Why? Theoretically, a CD-RW is re-writable, so we can theoratically recover a CD-RW to an as-received
state just like a new CD-RW. Why not? How?
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Question by:Johncili
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jhance earned 50 total points
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I think you are confusing the CD-RW "format" with "erase".  When FORMATTED a CD-RW has a file system
on it called UDF that is used to store data.  UDF (akin to FAT or NTFS) is specially designed for the
problems of doing a read/write filesystem the CD-RW media.  Once you've formatted in UDF the CD-R format
(which is NOT UDF but rather ISO-9660) cannot be written until/unless the CD-RW is ERASED.  This makes it essentially BLANK
and then it is just like new.

Most CD-RW authoring tools have an ERASE feature.
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