USB stick "read only"

[IC]

A PC running Win XP Pro SP1 used to react OK to my bytestor USB stick. On my
last attempt to use it I had problems.

I tried to copy some files from the HDD to the stick but they did not appear
on the stick. There was no message to say the copy had failed. When I
looked, I found all th files and directories on the stick were read only . I
unchecked the box and OK'd it, but when I checked again the r/o tag was
back.

I can delete files from the stick. I can copy files to the stick from a
command prompt. Attrib shows that the directories are no r/o, though XP
does. I can save a file to the stick. I can NOT copy a file from HDD to
stick.

The stick works fine in my Win 2k SP4 laptop and used to work fine on this
XP machine.

Any ideas?

 

[IC]

With reference to my USB read only problem, I was logged onto the XP machine
with administrator rights.