Fujitsu MAP3147FC manual Data Format, Each sector on the track consists of the following fields

Data Format

Each sector on the track consists of the following fields:

(1)Gaps (G1, G2, G3)

No pattern is written on the gap field.

(2)PLO Sync

In this field, pattern X'00' is written.

(3)Sync Mark (SM1, SM2)

In this field, special pattern is written. This special pattern indicates the beginning of the data field.

(4)Data field (DATA1-DATA4)

User data is stored in the data field of the sector. The length of the data field is equal to that of the logical data block which is specified with a parameter in the MODE SELECT command. Any multiple of 4 between 512 and 528 bytes can be specified as the length.

(5)BCRC

It is a 4-byte error detection code. Errors in the ID field. Single burst errors with lengths of up to 32 bits for each logical block can be detected.

(6)ECC

This is the 60-byte code that allows detection and correction of errors in the data field, which is capable of correcting the single burst error up to 240 bits max. on the fly.

(7)PAD

A specified length of x‘00’ pattern is written in this field. This field includes the variation by rotation and circuit delay till reading/writing.

3-8 C141-E163