Formatted Capacity; Actuator Lba Mapping; Fast Format - Logical Sector Size Conversion - Seagate Exos Enterprise ST18000NM0092 Product Manual

www.seagate.com
2.2

Formatted capacity

ST models
ST18000NM0092
ST16000NM0092
*One GB equals one billion bytes when referring to hard drive capacity. Accessible capacity may vary
depending on operating environment and formatting.
NOTE
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
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

Table 3 SET SECTOR CONFIGURATION EXT command inputs
Field
FEATURE
COUNT
LBA
DEVICE
COMMAND
Seagate Exos 2X18 SATA Product Manual, Rev. A
Formatted
capacity*
18TB
16TB
LBA Counts for drive capacities greater than 8TB are calculated based upon the
SFF-8447 standard publication.
www.seagate.com or openSeaChest via GitHub.com.
Description
COMMAND CHECK field
Bit Description
15 : 3 Reserved
2:0 SECTOR CONFIGURATION DESCRIPTOR INDEX field
Reserved
Bit Description
7 Obsolete
6 N/A
5 Obsolete
4 Transport Dependent
3:0 Reserved
7:0 B2h
Guaranteed Bytes per
sectors logical sector
35,156,656,128
512
(Default)
31,251,759,104
ftp://ftp.seagate.com/sff/SFF-8447.PDF
Drive specifications
Guaranteed Bytes per
sectors logical sector
4,394,582,016
4096
(see Section
3,906,469,888
2.2.2)
9