Figure 3.6 Sector Format - Fujitsu MAN3184MC - Enterprise 18.4 GB Hard Drive Product/Maintenance Manual

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.
(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
even number between 512 and 528 bytes can be specified as the length.
3 - 8
DATA2 BCRC ECC
PAD
Servo
G1
G1 6 bytes
G2 12 bytes
G3 8 bytes
PLO Sync 36 bytes
SM1 4 bytes
SM2 2 bytes
BCRC 4 bytes
ECC 60 bytes
PAD 6 bytes
DATA1 24 bytes
DATA2 488 bytes
DATA3
n bytes (0≤n≤464,
n is a multiple of 4.)
DATA4 (464 – n) bytes
Figure 3.6 Sector format
C141-E128-01EN
SCT
G2
PLO
SM1 DATA1 SM2 DATA4
Sync
SCT
BCRC ECC
PAD
G3