ATA characteristics:
ATA device
Model: Samsung SSD 840 PRO Series
Firmware revision: DXM06B0Q
Supported ATA versions: ATA-2 ATA-3 ATA/ATAPI-4 ATA/ATAPI-5 ATA/ATAPI-6 ATA/ATAPI-7 ATA8-ACS ATA8-ACS2
Maximum ATA revision supported: ATA8-ACS Revision 4c
Serial ATA device: : ATA8-AST SATA 1.0a SATA II Extensions SATA 2.5 SATA 2.6 SATA 3.0 SATA 3.1
PIO timing mode: 2
DMA timing mode: 2
Advanced PIO: PIO0 PIO1
Multi-word DMA: MDMA0 MDMA1 MDMA2
Ultra DMA: UDMA0 UDMA1 UDMA2 UDMA3 UDMA4 UDMA5 UDMA6 (active)
Logical sector size: 512 bytes
Cylinders: 16383 max., 16383 current
Heads: 16 max., 16 current
Sectors per track: 63 max., 63 current
Sectors addressable in CHS mode: 16514064 max., 16514064 current
Device size in CHS mode: 8455200768 bytes, 8455 Mb, 8063.51 MiB
Sectors addressable in sectors in 28-bit LBA mode: 268435455
Device size in 28-bit LBA mode: 137438952960 bytes, 137 Gb, 128.00 GiB
Sectors addressable in sectors in 48-bit LBA mode: 500118192
Device size in 48-bit LBA mode: 256060514304 bytes, 256 Gb, 238.47 GiB

Device is fixed
Device does not require SET FEATURES to spin up and IDENTIFY DEVICE response is complete.
Device capabilities:
Standby time values are standard
IORDY is supported and can be disabled
DMA is supported
A maximum of 16 sectors can be transferred per interrupt on READ/WRITE MULTIPLE
Device supports setting a maximum of 16 sectors
At minimum 120 ns. transfer cycle time per word in MDMA, 120 ns. recommended
At minimum 120 ns. transfer cycle time per word in PIO, without flow control
At minimum 120 ns. transfer cycle time per word in PIO, with IORDY flow control
32 depth of queue maximum
SATA 1.5Gb/s is supported
SATA 3.0Gb/s is supported
SATA 6.0Gb/s is supported
PHY Event counters are supported
NCQ is supported
Command set and features:
NOP is supported and enabled
READ BUFFER is supported and enabled
WRITE BUFFER is supported and enabled
Host Protected Area is supported and enabled
Look-ahead read is supported and enabled
Write cache is supported and enabled
Power management is supported and enabled
Security mode is supported
28-bit LBA is supported
48-bit LBA is supported and enabled
FLUSH CACHE is supported and enabled
FLUSH CACHE EXT is supported and enabled
Device Configuration Overlay feature set is supported and enabled
SET MAX security extension is supported
DOWNLOAD MICROCODE is supported and enabled
S.M.A.R.T. is supported and enabled
S.M.A.R.T. Command Transport is supported
S.M.A.R.T. self-testing is supported and enabled
S.M.A.R.T. error logging is supported and enabled
Device has a World Wide Name
WRITE DMA FUA EXT and WRITE MULTIPLE FUA EXT are supported and enabled
General Purpose Logging is supported and enabled
Segmented feature in DOWNLOAD MICROCODE is supported and enabled
READ/WRITE DMA EXT GPL are supported and enabled
WRITE UNCORRECTABLE is supported and enabled
Write/Read/Verify is supported
0 sectors for Write/Read/Verify mode 2
0 sectors for Write/Read/Verify mode 3
BLOCK ERASE EXT is supported
OVERWRITE EXT is supported
CRYPTO SCRAMBLE EXT is supported
Sanitize feature set is supported
Sanitize commands are specified by ACS-2
READ LOG DMA EXT is supported
RECEIVE FPDMA QUEUED and SEND FPDMA QUEUED are supported
DMA Setup auto-activation is supported
Device-initiated power management is supported
Hardware Feature Control is supported and enabled
Software Settings Preservation is supported
TRIM is supported
DATA SET MANAGEMENT can receive a maximum of 8 blocks of 512 bytes
Security:
Security is not enabled
Supports enhanced security erase
2 minutes to complete secure erase
2 minutes to complete enhanced secure erase
Master password revision code: 65534
S.M.A.R.T. Command Transport (SCT):
SCT Write Same is supported
SCT Error Recovery Control is supported
SCT Features Control is supported
SCT Data Tables are supported

Device supports READ SECTOR(S) command in CHS mode
Device supports READ SECTOR(S) RETRY command in CHS mode
Device supports READ DMA command in CHS mode
Device supports READ DMA RETRY command in CHS mode
Device supports READ SECTOR(S) command in 28-bit LBA mode
Device supports READ SECTOR(S) RETRY command in 28-bit LBA mode
Device supports READ DMA command in 28-bit LBA mode
Device supports READ DMA RETRY command in 28-bit LBA mode
Device supports READ SECTOR(S) command in 48-bit LBA mode
Device supports READ DMA command in 48-bit LBA mode
Device supports SEEK command in CHS mode
Device supports SEEK command in 28-bit LBA mode