SSDD 8 Each 1024 Byte Sector Track Format

This is an IBM System 34 Disk 2D Standard format.

Field Length Data Clock Value (179X)
Gap I800x4ENA0x4E
Sync I120x00NA0x00
Sync I30xA10xC70xF6
IM10xFC0xD70xFC
GAP III500x4ENA0x4E
Following repeated 8 times to ***
Sync III120x00NA0x00
Sync III30xA1NA0xF5
AM 110xFE0xC70xFE
Cyl #10-76NA0-76
Head #10-1NA0-1
Rec #11-26NA1-26
N12NA2
CRC2CRCNA0xF7 (generates both CRC bytes)
GAP II220xFFNA0xFF
Sync II120x00NA0x00
Sync II30xA1NA0xF5
AM 210xFB0xC70xFB
Data10240xE5NA0xE5
CRC2CRCNA0xF7 (generates both CRC bytes)
GAP III540x4ENA0x4E
***
GAP IV~11500x4ENA0x4E
Total Bytes/Sector1140
Total Bytes/Track10416

Bill

1504 MST 8 May 2013