HELP!!! DVD+RW discs are not recognized as rewritable

[xenogear3]

I have 4 Fuji DVD+RW discs. They work fine for 1 year. Today, all 4 Fuji DVD+RW discs are no longer recognized as rewritable. I tried DVD Decrypter and Alcohol 120. Both applications cannot tell any information (such as brand name, media ID and write speed) about these 4 discs. I can still read the data from the discs, such as watch movie from it.

These 4 DVD+RW discs are the only rewritable DVD discs I have, so I cannot tell if it is the disc or the DVD RW drive. However, my DVD RW drive seems fine, and it can detect CD+RW and burn DVDs.

I wonder what is the problem.

[Krispy Kritter]

Are they only being used in your computer or have they been used in a standalone dvd recorder?