™ dual-disk subsystem similar to the
1053 Mod. II, except with a total of 287KB of formatted on-line storage (Mod II has
The 1053-I is the dual-drive version of the single-drive 1042-I
The roman numeral "I" indicates it operates at 35 tracks / 48 TPI. This drive only
accepts hard-sectored media when used with the bundled Micropolis 1071
The subsystem is usually presented with a capacity of 287KB. With the unit being a dual-drive
assembly, this can be misleading, suggesting each drive would hold 287KB by using dual
heads writing on double sided media. In reality, each drive is a single head drive and stores
143K, but two drives with 143K provide 287KB of on-line storage per unit.
Note on Micropolis' floppy drive naming convention
If you ask yourself what the meaning of the Roman numeral literals in disk drive names
is, here's the explanation: Labeling convention for the Micropolis floppy disk drives
from the 1040/1050 series is that each model number is followed by either the notation
"Mod I" or "Mod II". These notations indicate whether the system operates at a track
density of 48 TPI (35 tracks total) or 100 TPI (77 tracks total). "Mod I" storage modules
have a black disk load actuator and "Mod II" modules have a blue disk load actuator.