IBM Professional Series User Manual page 388

Appendix D. Operating Hints
Backing up Minidisks
VM/PC minidisks are managed as files with a
"filename. extension" of "userid.device address" and may be
exist on either a fixed disk drive, or a diskette drive. You
may wish to periodically back-up your minidisks to prevent
data loss or for security reasons. Since a minidisk is a DOS
2.00 file, it may be backed up with any of the backup
facilities available with DOS 2.00.
Minidisks on Diskettes
If you define a minidisk on a diskette drive, you should not
remove the diskette while a command is executing. You
should wait for all commands you have issued to complete
before removing the diskette from the drive. In addition, any
time you insert such a minidisk in the drive, issue the
ACCESS command to update the virtual storage copy of the
new minidisk's directory.
Also, if the CMS mini disk to be used does not yet exist on
the diskette, you should issue the CP LINK command, prior
to using the CMS minidisk, to ensure that the proper DOS
file allocation takes place on the diskette prior to your using
the minidisk. Failure to do this may result in unreadable data
on the diskette.
Transporting eMS Files
There are two methods of transporting CMS files between
VM/PC systems. The first uses the EXPORT and IMPORT
commands; the second uses a minidisk defined on a diskette.
EXPORT jIMPORT Method
The file to be transported is EXPORTed to a diskette (the
Personal Computer DOS filespec is given as an operand of
the EXPORT command). The diskette is then carried to
Appendix D. Operating Hints D-l