Seagate ST3500620SS Manual download pdf (Page 17)

Barracuda ES.2 SAS Product Manual, Rev. G 11

4.0 Performance characteristics

This section provides detailed information concerning performance-related characteristics and features of

Barracuda ES.2 SAS drives.

4.1 Internal drive characteristics

ST31000640SS ST3750630SS ST3500620SS

Drive capacity 1,000 750 500 Gbytes (formatted, rounded value)

Read/write data heads 8 6 4

Tracks per inch 150,000 150,000 150,000 TPI

Peak bits per inch 1,090k 1,090k 1,090k BPI

Areal Density 164 164 164 Gbits/inch

Internal data rate 1,287 1,287 1,287 Mb/s max (variable with zone)

Sustained data rate 116 116 116 MB/s max (variable with zone)*

Disk rotation speed 7,200 7,200 7,200 RPM

Avg rotational latency 4.16 4.16 4.16 msec

*One Gbyte equals one billion bytes when referring to hard drive capacity. Accessible capacity may vary depending on operating environment

and formatting.

4.2 Seek performance

See Section 9.4.1, "SAS physical interface" on page 55 and the SAS Interface Manual (part number

100293071) for additional timing details.

4.2.1 Access time

Not Including controller overhead

(msec)

1. Typical access times are measured under nominal conditions of temperature, voltage, and

horizontal orientation as measured on a representative sample of drives.

2. Access to data = access time + latency time.

Read Write

Average Typical 7.4 8.5

Single track Typical 0.4 1.0

Full stroke Typical 14.3 15.4

1 2 ... 12 13 14 15 16 17 18 19 20 21 22 ... 77 78

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Seagate ST3500620SS Manual Page 17