Seagate Exos X20z SATA Product Manual, Rev. B
8
www.seagate.com
Drive specifications
1.2.2
Formatted capacity
*One GB equals one billion bytes when referring to hard drive capacity. Accessible capacity may vary depending on operating environment and formatting.
NOTE
LBA Counts for drive capacities greater than 8TB are calculated based upon the
SFF-8447 standard publication.
ftp://ftp.seagate.com/sff/SFF-8447.PDF
1.2.2.1
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
.
See
Section 1.5.3.1, "Identify Device command"
(words 60-61 and 100-103) for additional information about 48-bit
addressing support of drives with capacities over 137GB.
1.2.3
Recording and interface technology
1.2.4
Start/stop times
NOTE
Power-on to ready time is based on typical operating conditions, and default
full current spin-up profile.
ST models
Formatted
capacity*
Guaranteed
sectors
Bytes per
logical sector
ST20000NM001J
20TB
39,063,650,304
512 (Default)
Interface
Serial ATA (SATA)
Recording method
Perpendicular
Recording density, KBPI (Kb/in max)
2480
Track density, KTPI (ktracks/in avg)
540
Areal density (Gb/in
2
avg)
1340
Spindle speed (RPM) (± 0.2%)
7200
Internal data transfer rate (Mb/s max)
2880
Sustained data transfer rate (MiB/s max)
249
I/O data-transfer rate (MB/s max)
600 (Ultra DMA mode 5)
Power-on to Ready (sec) (typ/max)
25/30
Standby to Ready (sec) (typ/max)
25/30
Ready to spindle stop (sec) (max)
20
