Sector Format - Fujitsu MAH3091MC - Enterprise 9.1 GB Hard Drive Product/Maintenance Manual

3.1.4

Sector format

Each sector on the track consists of an ID field, a data field, and a gap field which separates them.
Figure 3.6 gives sector format examples.
SCT
PLO
SM1 DATA1 SM2
G1 Sync
SCT
PLO
SM1 DATA1 SM2 DATA3 PAD G2
G1 Sync
Each sector on the track consists of the following fields:
(1) Gaps (G1, G2, G3)
The gap length at the time of formatting (initializing) is listed in Figure 3.6. No pattern is written
on the gap field.
(2) PLO Sync
In this field, pattern X'00' in the length in bytes listed in Figure 3.6 is written.
(3) Sync Mark (SM1, SM2)
In this field, special pattern in the length in bytes listed in Figure 3.6 is written. This special
pattern indicates the beginning of the data field.
3 - 8
DATA2 BCRC ECC
PAD
Servo
G1
G1
G2 11 bytes
G3
PLO Sync 30 bytes
SM1
SM2
BCRC
ECC 40 bytes
PAD
DATA1 20 bytes
DATA2 492 bytes
DATA3
n bytes (0≤n≤472,
n is a multiple of 4.)
DATA4 (472 – n) bytes
Figure 3.6

Sector format

C141-E103-02EN
SCT
G2
PLO
SM1 DATA1 SM2 DATA4
Sync
4 bytes
8 bytes
4 bytes
2 bytes
4 bytes
6 bytes
SCT
BCRC ECC
PAD
G3