Data Interchange on 90 mm Flexible Disk
Cartridges - 326 Data Tracks on each Side - Capacity: 21 Mbytes
- ISO Type 305
This Ecma Standard specifies the characteristics of 90 mm flexible
disk cartridges (FDC) of 21 Mbytes formatted capacity, recorded
at 31 831 ftprad in the Inner Zone and 47 747 ftprad in the Outer
Zone with sector servo tracking on 326 data tracks on each side,
using 2-7 RLL recording.
It specifies the mechanical, physical and magnetic characteristics
of the cartridge, so as to provide physical interchangeability
between data processing systems.
It also specifies the method of recording, the quality of recorded
signals, the track layouts and the track formats of data tracks
and servo tracks.
Such flexible disk cartridges are identified as ISO
Type 305 .
Together with a standard for volume and file structure, for instance
Standard ECMA-107, this Standard provides
for full data interchange between data processing systems.
The following files can be freely downloaded:
||3 980 464
||Acrobat (r) PDF file
This Ecma publication is also approved as ISO/IEC 14169.