Hdparm test:
~ # hdparm -I /dev/sda
/dev/sda:
ATA device, with non-removable media
Model Number: ST4000LM024-2AN17V
Serial Number: WCKATJEY
Firmware Revision: 0001
Transport: Serial, ATA8-AST, SATA 1.0a, SATA II Extensions, SATA Rev 2.5, SATA Rev 2.6, SATA Rev 3.0
Standards:
Used: unknown (minor revision code 0x006d)
Supported: 10 9 8 7 6 5
Likely used: 10
Configuration:
Logical max current
cylinders 16383 16383
heads 16 16
sectors/track 63 63
--
CHS current addressable sectors: 16514064
LBA user addressable sectors: 268435455
LBA48 user addressable sectors: 7814037168
Logical Sector size: 512 bytes
Physical Sector size: 4096 bytes
Logical Sector-0 offset: 0 bytes
device size with M = 1024*1024: 3815447 MBytes
device size with M = 1000*1000: 4000787 MBytes (4000 GB)
cache/buffer size = unknown
Form Factor: 2.5 inch
Nominal Media Rotation Rate: 5526
Capabilities:
LBA, IORDY(can be disabled)
Queue depth: 32
Standby timer values: spec'd by Standard, no device specific minimum
R/W multiple sector transfer: Max = 1 Current = ?
Advanced power management level: 128
Recommended acoustic management value: 208, current value: 208
DMA: mdma0 mdma1 *mdma2 udma0 udma1 udma2 udma3 udma4 udma5 udma6
Cycle time: min=120ns recommended=120ns
PIO: pio0 pio1 pio2 pio3 pio4
Cycle time: no flow control=120ns IORDY flow control=120ns
~ # hdparm -t /dev/sda
/dev/sda:
Timing buffered disk reads: 430 MB in 3.01 seconds = 142.97 MB/sec
~ # hdparm -Tt /dev/sda
/dev/sda:
Timing cached reads: 1632 MB in 2.00 seconds = 815.68 MB/sec
Timing buffered disk reads: 424 MB in 3.01 seconds = 140.78 MB/sec
~ # hdparm -t --direct /dev/sda
/dev/sda:
Timing O_DIRECT disk reads: 390 MB in 3.00 seconds = 129.81 MB/sec
~ # hdparm -Tt --direct /dev/sda
/dev/sda:
Timing O_DIRECT cached reads: 582 MB in 2.00 seconds = 290.96 MB/sec
Timing O_DIRECT disk reads: 426 MB in 3.01 seconds = 141.66 MB/sec
~ # hdparm --offset 20 -t /dev/sda
/dev/sda:
Timing buffered disk reads (offset 20 GB): 416 MB in 3.01 seconds = 138.28 MB/sec
~ # hdparm --offset 20 -T /dev/sda
/dev/sda:
Timing cached reads: 1646 MB in 2.00 seconds = 822.39 MB/sec
~ # hdparm -tv /dev/sda
/dev/sda:
multcount = 0 (off)
readonly = 0 (off)
readahead = 8192 (on)
geometry = 486401/255/63, sectors = 7814037167, start = 0
Timing buffered disk reads: 428 MB in 3.01 seconds = 142.09 MB/sec