Seagate Exos X20 SATA Product Manual, Rev. B
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
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
COMMAND CHECK field value is taken from the DESCRIPTOR CHECK field in the descriptor specified by the
SECTOR CONFIGURATION DESCRIPTOR INDEX field
SECTOR CONFIGURATION DESCRIPTOR INDEX field specifies the Sector Configuration descriptor in the Set Sector
Configuration log page
ST models
Formatted
capacity*
Guaranteed
sectors
Bytes per
logical sector
Guaranteed
sectors
Bytes per
logical sector
ST20000NM007D,
ST20000NM000D
20TB
39,063,650,304
512
(Default)
4,882,956,288
4096
)
ST18000NM003D,
ST18000NM008D
18TB
35,156,656,128
4,394,582,016
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
