Yes these were readable in the past, one in particular was just yesterday.
Which is when the problem started.
I was copying the files on it, about 130 pdf files, which took a while.
It stalled in the middle of the copy, with about 10 files left, saying it had a problem
with certain file.
I reloaded the disk and copied 6 more files one by one.
This is when/how it started.
Now neither this disk or others will read, although others will read.
Most of these, so far, are either cd's that Ive burned in the past or
others have i.e., not commercial.
Nothing other than that has happend and I haven't disturbed anything
on the computer, files etc...