Product manual

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