Product manual

Cheetah 15K.3 FC Product Manual, Rev. D 9
4.0 Performance characteristics
This section provides detailed information concerning performance-related characteristics and features of
Cheetah 15K.3 FC drives.
4.1 Internal drive characteristics
ST373453FC ST336753FC ST336753FC
Drive capacity 73.4 36.7 18.4 Gbytes (formatted, rounded off value)
Read/write data heads 8 4 2
Bytes per track 377,770 377,770 377,770 Bytes (average, rounded off values)
Bytes per surface 12,046 12,046 12,046 Mbytes (unformatted, rounded off value)
Tracks per surface (total) 31,310 31,310 31,310 Tracks (user accessible)
Tracks per inch 64,000 64,000 64,000 TPI
Peak bits per inch 542 542 542 KBPI
Internal data rate 609-891 609-891 609-891 Mbits/sec (variable with zone)
Disc rotation speed 15k 15k 15k rpm
Avg rotational latency 2.0 2.0 2.0 msec
4.2 Seek performance characteristics
See Section 9.5, "FC-AL physical interface" on page 55 and the
Fibre Channel Interface Manual (part number
77767496) for additional timing details.
4.2.1 Access time
4.2.2 Format command execution time for ≥ 512-byte sectors (minutes)
Including controller overhead
1
,
2
(msec)
1. Execution time measured from receipt of the FCP Command to the FCP Response.
2. Assumes no errors and no sector has been relocated.
Not including controller overhead
1,2
(msec)
Read Write Read Write
Average Typical
3
,
4
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.
3.8 4.1 3.6 3.9
Single track Typical
3,4
0.40 0.60 0.20 0.40
Full stroke Typical
3,4
6.7 7.1 6.5 6.9
ST373453FC ST336753FC ST318453FC
Maximum (with verify)
90 60 30
Maximum (without verify)
45 30 15