IBM R30 Operator's Manual page 48

8 mm Media Capacity vs File Size
5.0GB Mode
5.0
4.0
3.0
2.0
1.0
0.0
1G 1M 100K 10K 1K
100M 10M
Average Data File Size
(One filemark per data file)
Short Filemark Long Filemark
2-28
Operator Guide