Seagate ST300MM0026 Savvio 10K.2 SAS Product Manual - Page 16

Performance characteristics

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5.0 Performance characteristics This section provides detailed information concerning performance-related characteristics and features of Savvio drives. 5.1 Internal 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 Internal data rate Disk rotation speed Avg rotational latency ST9146802SS ST973402SS 146.8 73.4 4 2 489,984 489,984 36,704 36,704 75,373 75,373 150,000 150,000 925,000 925,000 135 135 660-1054 660-1054 10k 10k 3.0 3.0 Gbytes (formatted, rounded off value) Bytes (average, rounded off values) Mbytes (unformatted, rounded off value) Tracks (user accessible) TPI (average) BPI Gbit/in2 Mbits/sec (variable with zone) rpm ms 5.2 Seek performance characteristics See Section 10.4.1, "SAS physical interface" on page 50 and the SAS Interface Manual (part number 100293071) for additional timing details. 5.2.1 Access time Average Single track Full stroke Typical3,4 Typical3,4 Typical3,4 Including controller overhead1, 2 (ms) Read Write 4.0 4.6 0.4 0.6 8.17 8.76 Not including controller overhead1,2 (ms) Read Write 3.8 4.4 0.2 0.4 7.97 8.56 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. Data sheet data except full stroke which was Gen 2.0 data. 10 Savvio 10K.2 SAS Product Manual, Rev. E

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10
Savvio 10K.2 SAS Product Manual, Rev. E
5.0
Performance characteristics
This section provides detailed information concerning performance-related characteristics and features of Sav-
vio drives.
5.1
Internal drive characteristics
ST9146802SS ST973402SS
Drive capacity
146.8
73.4
Gbytes (formatted, rounded off value)
Read/write data heads
4
2
Bytes per track
489,984
489,984
Bytes (average, rounded off values)
Bytes per surface
36,704
36,704
Mbytes (unformatted, rounded off value)
Tracks per surface (total)
75,373
75,373
Tracks (user accessible)
Tracks per inch
150,000
150,000
TPI (average)
Peak bits per inch
925,000
925,000
BPI
Areal density
135
135
Gbit/in
2
Internal data rate
660-1054
660-1054
Mbits/sec (variable with zone)
Disk rotation speed
10k
10k
rpm
Avg rotational latency
3.0
3.0
ms
5.2
Seek performance characteristics
See Section 10.4.1, "SAS physical interface" on page
50 and the
SAS Interface Manual
(part number
100293071) for additional timing details.
5.2.1
Access time
Including controller overhead
2
(ms)
1
1.
Execution time measured from receipt of the Command to the Response.
,
Average
Typical
4
3
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.
4.0
4.6
3.8
4.4
Single track
Typical
3,4
0.4
0.6
0.2
0.4
Full stroke
Typical
3,4
8.17
8.76
7.97
8.56
Data sheet data except full stroke which was Gen 2.0 data.
2.
Assumes no errors and no sector has been relocated.
Not including controller overhead
1,2
(ms)
Read
Write
Read
Write