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CONSTELLATION ES.2 SERIAL ATA PRODUCT MANUAL, REV. H 7
2.3 DEFAULT LOGICAL GEOMETRY
CYLINDERS READ/WRITE HEADS SECTORS PER TRACK
16,383 16 63
LBA mode
When addressing these drives in LBA mode, all blocks (sectors) are consecutively numbered from 0 to n–1, where n is the number of
guaranteed sectors as defined above.
2.4 RECORDING AND INTERFACE TECHNOLOGY
Interface Serial ATA (SATA)
Recording method Perpendicular
Recording density, KBPI (Kb/in max) 1638
Track density, KTPI (ktracks/in avg) 270
Areal density (Gb/in
2
avg) 444
Spindle speed (RPM) (± 0.2%) 7200
Internal data transfer rate (Mb/s max) 1900
Sustained data transfer rate (MB/s max) 155
I/O data-transfer rate (MB/s max) 600 (Ultra DMA mode 5)
2.5 PHYSICAL CHARACTERISTICS
Weight: (maximum) (3TB models) 680g (1.499 lb)
Weight: (maximum) (2TB models) 655g (1.444 lb)
Cache buffer 64MB (64,768KB)
2.6 SEEK TIME
Seek measurements are taken with nominal power at 25°C ambient temperature. All times are measured using drive diagnostics. The
specifications in the table below are defined as follows:
• Track-to-track seek time is an average of all possible single-track seeks in both directions.
• Average seek time is a true statistical random average of at least 5000 measurements of seeks between random tracks,
less overhead.
*TYPICAL SEEK TIMES (MS) READ WRITE
Track-to-track 0.50 0.50
Average 8.5 9.5
Average latency: 4.16
*Measured in performance mode.
Note. These drives are designed to consistently meet the seek times represented in this manual. Physical seeks,
regardless of mode (such as track-to-track and average), are expected to meet the noted values. However, due
to the manner in which these drives are formatted, benchmark tests that include command overhead or measure
logical seeks may produce results that vary from these specifications.