A related issue is printing. Generally, people want to print their files on the printer in their home or office. See the TCP3270 and TN3270 documents for details. Please refer to the separate document Tape User's Guide. Tapes are an alternative storage medium for files.
Tapes are relatively inexpensive and portable.
UNET can handle 9-track tapes in densities 1600 and 6250 BPI, and cartridge tapes.