IBM RT PC 10 Hardware Maintenance And Service page 247

Personal Computer AT High Capacity Diskette Drive
The Personal Computer AT High Capacity Diskette Drive can store up to
1.2M bytes of formatted data on a Double-Sided, Cobalt-Enhanced
Oxide-Coated Diskette. This drive is a single field replaceable unit.
Specifications
Diskette type
Total tracks
Sectors per track
Bytes per sector
Tracks per inch
Maximum number
Adapter
Removal and Replacement Procedures
5.25 inch, double-sided, cobalt-enhanced
oxide-coating
160 (80 tracks per side)
15
512
96
1
Personal Computer AT Fixed-Disk and Diskette
Drive Adapter
Use the "Diskette Drive Removal" on page 4-24 procedure for removal.
Use the "Diskette Drive Replacement" on page 4-26 procedure for
replacement.
7-4 Service Manual