Seagate NAS HDD and NAS +SRS HDD Product Manual, Rev. E
9
Drive Specifications
2.2
Formatted capacity
*One GB equals one billion bytes and 1TB equals one trillion bytes when referring to hard drive capacity. Accessible capacity may vary depending on
operating environment and formatting.
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 4.3.1, "Identify Device command" (words 60-61 and 100-103) for additional information about 48-bit
addressing support of drives with capacities over 137GB.
2.3
Default logical geometry
•
Cylinders
: 16,383
•
Read/write heads
: 16
•
Sectors per track
: 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
Model
Formatted capacity*
Guaranteed sectors
Bytes per sector
ST4000VX000 and ST4000VX002
4000GB
7,814,037,168
4K
ST3000VX002
3000GB
5,860,533,168
Interface
SATA
Recording method
TGMR
Recording density
(kFCI)
4TB
2054
3TB
1849
Track density
(ktracks/inch avg)
390
Areal density
(Gb/in
2
avg)
4TB
811
3TB
730
Internal data transfer rate
(Mb/s max)
4TB
2111
3TB
1858
Maximum sustained data transfer rate, OD read
(MB/s)
190
I/O data-transfer rate
(MB/s max)
600