Sony KLV-21SG2 - Manual (Page 71)

“Memory Stick”
71
File error The selected folder has not been
named correctly. Re-enter the
name with fewer than 66
characters, including “/” by
displaying the “Select Folder”
menu.
Read Only Memory A read-only “Memory Stick” has
been inserted. You cannot record
or delete the data on a read-only
“Memory Stick.”