Seagate Exos 2X18 SATA Product Manual, Rev. A
9
www.seagate.com
Drive specifications
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
2.2.1
Actuator LBA mapping
Exos 2X18 is a device that contains two actuators which can read and write concurrently. The first 50% of the device's
LBA space is mapped to the primary actuator and the second 50% of the LBA space is mapped to the secondary
actuator. Exos 2X18 supports the Concurrent Positioning Ranges log page 47h which indicates the sets of contiguous
LBAs within each actuator for which positioning is possible at the same time. See ACS-5, Rev. 6 or beyond for details.
For your convenience, the Concurrent Positioning Range log page details can be identified using SeaChest Utilities
software available at
www.seagate.com
or openSeaChest via
2.2.2
Fast Format - logical sector size conversion
Drive supports either 512E or 4KN logical sector size formats
SET SECTOR CONFIGURATION EXT (B2h) command (ACS-4 Standard) quickly converts between 512 and 4096 byte logical
sector size formats
The selected sector size change occurs immediately upon command completion
Default shipping format is 512E
ST models
Formatted
capacity*
Guaranteed
sectors
Bytes per
logical sector
Guaranteed
sectors
Bytes per
logical sector
ST18000NM0092
18TB
35,156,656,128
512
(Default)
4,394,582,016
4096
)
ST16000NM0092
16TB
31,251,759,104
3,906,469,888
Table 3 SET SECTOR CONFIGURATION EXT command inputs
Field
Description
FEATURE
COMMAND CHECK field
COUNT
Bit Description
15 : 3 Reserved
2:0 SECTOR CONFIGURATION DESCRIPTOR INDEX field
LBA
Reserved
DEVICE
Bit Description
7 Obsolete
6 N/A
5 Obsolete
4 Transport Dependent
3:0 Reserved
COMMAND
7:0 B2h
