USB Memory stick

[M.Lewis]

A few days ago I copied some files to a USB Memory stick. No problem. 
Now I'm needing to copy some more files to the same memory stick and 
it's telling me it's a read-only file system. I had zero problems with 
this the other day.

mount is as follows:
/dev/sda1 on /media/USB-DISK type vfat 
(rw,noexec,nosuid,nodev,noatime,uid=500,utf8,shortname=lower)

It should be writeable.

Thanks for any pointers.
Mike

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