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4.0
P
ERFORMANCE CHARACTERISTICS
This section provides detailed information concerning performance-related characteristics and features of Savvio drives.
4.1
I
NTERNAL DRIVE CHARACTERISTICS
Drive capacity
Read/write data heads
Bytes per track
Bytes per surface
Tracks per surface (total)
Tracks per inch
Peak bits per inch
Areal density
Disk rotation speed
Avg rotational latency
4.2
S
EEK PERFORMANCE CHARACTERISTICS
See Section 11.4.1, "SAS physical interface" on page 60 and the SAS Interface Manual (part number 100293071) for
additional timing details.
4.2.1
Access time
Average
900GB models
Single track
3,4
Typical
Full stroke
Average
600, 450, 300GB
Single track
models
3
,
4
Typical
Full stroke
1.
Execution time measured from receipt of the Command to the Response.
2.
Assumes no errors and no sector has been relocated.
3.
Typical access times are measured under nominal conditions of temperature, voltage, and horizontal orientation as measured on a representative
sample of drives.
4.
Access time = controller overhead + average seek time and applies to all data transfer commands.
Access to data = access time + latency time.
4.2.2
Format command execution time for 512-byte sectors (minutes)
Maximum (with verify)
Maximum (without verify)
Execution time measured from receipt of the last byte of the Command Descriptor Block (CDB) to the request for a Status
Byte Transfer to the Initiator (excluding connect/disconnect).
When changing sector sizes, the format times shown above may need to be increased by 30 minutes.
S
10K.5 SAS P
AVVIO
RODUCT
ST9900805SS
ST9600205SS
ST9900705SS
ST9600105SS
ST9900605SS
ST9600005SS
900
600
6
4
821.4
821.4
151,800
151,800
184,799
184,799
300
300
1686
1686
506
506
10K
10K
3.0
3.0
I
NCLUDING CONTROLLER OVERHEAD
R
EAD
3.9
0.4
7.9
3.6
0.4
7.3
900GB models
234
116
M
, R
. J
ANUAL
EV
ST9450405SS
ST9300605SS
ST9450305SS
ST9300505SS
ST9450205SS
ST9300405SS
450
300
3
2
821.4
821.4
151,800
151,800
184,799
184,799
300
300
1686
1686
506
506
10K
10K
3.0
3.0
,
1
2
N
(
)
MS
OT INCLUDING CONTROLLER OVERHEAD
W
RITE
4.3
0.6
8.3
4.0
0.6
7.6
600GB models
450GB models
156
117
75
58
GB
(formatted, rounded off value)
KBytes
(avg, rounded off values)
MB
(unformatted, rounded off value
Tracks
(user accessible)
KTPI
(average)
kBPI
2
Gb/in
rpm
ms
R
W
EAD
3.7
0.2
7.7
3.4
0.2
7.1
300GB models
78
36
)
1,2
(
)
MS
RITE
4.1
0.4
8.1
3.8
0.4
7.4
9
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