Seagate ST33000651SS Constellation ES SAS Product Manual - Page 18

Performance characteristics

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5.0 Performance characteristics This section provides detailed information concerning performance-related characteristics and features of Constellation ES 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 Disc rotation speed Avg rotational latency ST32000444SS ST32000445SS ST32000446SS 2000 8 1,012,608 250,000 248,600 237,000 1,515,000 347 95 - 212 7200 4.16 ST31000424SS ST31000425SS ST31000426SS 1000 4 1,012,608 250,000 248,600 237,000 1,515,000 347 95 - 212 7200 4.16 ST3500414SS ST3500415SS ST3500416SS 500 GB (formatted, rounded off value) 2 1,012,608 Bytes (average, rounded off values) 250,000 MB (unformatted, rounded off value) 248,600 Tracks (user accessible) 237,000 TPI (average) 1,515,000 347 BPI Gb/in2 95 - 212 MB/s (variable with zone) 7200 rpm 4.16 ms 5.2 Seek performance characteristics See Section 12.4.1, "SAS physical interface" on page 64 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 Not including controller overhead1, 2 (ms) Read Write 8.3 9.3 0.5 0.8 18 19 Including controller overhead1, 2 (ms) Read Write 8.5 9.5 0.7 1.0 18.2 19.2 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. 10 Constellation ES Series SAS Product Manual, Rev. F

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10
Constellation ES Series SAS Product Manual, Rev. F
5.0
Performance characteristics
This section provides detailed information concerning performance-related characteristics and features of Con-
stellation ES drives.
5.1
Internal drive characteristics
ST32000444SS
ST31000424SS
ST3500414SS
ST32000445SS
ST31000425SS
ST3500415SS
ST32000446SS
ST31000426SS
ST3500416SS
Drive capacity
2000
1000
500
GB (formatted, rounded off value)
Read/write data heads
8
4
2
Bytes per track
1,012,608
1,012,608
1,012,608
Bytes (average, rounded off values)
Bytes per surface
250,000
250,000
250,000
MB (unformatted, rounded off value)
Tracks per surface (total)
248,600
248,600
248,600
Tracks (user accessible)
Tracks per inch
237,000
237,000
237,000
TPI (average)
Peak bits per inch
1,515,000
1,515,000
1,515,000
BPI
Areal density
347
347
347
Gb/in
2
Internal data rate
95 - 212
95 - 212
95 - 212
MB/s (variable with zone)
Disc rotation speed
7200
7200
7200
rpm
Avg rotational latency
4.16
4.16
4.16
ms
5.2
Seek performance characteristics
See Section 12.4.1, "SAS physical interface" on page 64 and the
SAS Interface Manual
(part number
100293071) for additional timing details.
5.2.1
Access time
Not 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.
8.3
9.3
8.5
9.5
Single track
Typical
3,4
0.5
0.8
0.7
1.0
Full stroke
Typical
3,4
18
19
18.2
19.2
2.
Assumes no errors and no sector has been relocated.
Including controller overhead
1, 2
(ms)
Read
Write
Read
Write