Seagate BARRACUDA 2LP, Product Manual

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Barracuda 2LP Product Manual, Rev. D 13
Start
Has
10 min. TCAL
timer
expired?
Reset
10 minute
TCAL timer
Yes
No
Yes
Yes
A
Is
SCSI
command in
progress?
Read
ahead
pending?
No
No
Complete
command
Seek to
TCAL cyl
and select
head zero
Hold
(wait for next
command)
Write/Read
Miss
command
Read
Sequential
command
Independent
10 Minute
Periodic
Abortive Read
Lookahead
Timer
TCAL
head
Has
target
received a SCSI
command?
No
Yes
Yes
A
All
heads
calibrated?
No
Yes
Select
next
head
All
heads
calibrated?
Yes
Yes
Read
ahead
pending?
Has
10 min. TCAL
timer
expired?
No
No
No
Complete
command
Seek to
TCAL cyl
and select
next head
Hold
(wait for next
command)
Write/Read
Miss
command
Read
Sequential
command
Independent
10 Minute
Periodic
Abortive Read
Lookahead
Timer
Figure 3. ASA I OEM thermal calibration
5.2.1 Seek time
Drive including
controller overhead
Drive level (msec) without disconnect (msec)
read write read write
Average typical* 8.0 9.0 9.0 10.0
Single track typical* 0.6 0.9 1.6 1.9
Full stroke typical* 17 19 18.0 20.0
*Typical seek values are measured under nominal conditions of tempera-
ture, voltage, and horizontal orientation on a representative sample of
drives.
5.2.2 Format drive command execution time
for
≥≥≥≥≥
512-byte sectors
ST31250 ST32550
Maximum (with verify) 15 minutes 30 minutes
Maximum (without verify) 10 minutes 20 minutes