NEC Versa S5200 laptop with FUJITSU MHV2080B SATA disk. Kernel
2.6.16.21-0.13-smp (suselinux 10.1) using ata_piix. hdparm and sdparm
give inconsistent results, which one should I believe? My main concern
is write caching (XFS filesystem).
hdparm -I
/dev/sda:
ATA device, with non-removable media
Model Number: FUJITSU MHV2080BH
Serial Number: NW28T62255WF
Firmware Revision: 00000028
Standards:
Supported: 7 6 5 4
Likely used: 7
Configuration:
Logical max current
cylinders 16383 16383
heads 16 16
sectors/track 63 63
--
CHS current addressable sectors: 16514064
LBA user addressable sectors: 156301488
LBA48 user addressable sectors: 156301488
device size with M = 1024*1024: 76319 MBytes
device size with M = 1000*1000: 80026 MBytes (80 GB)
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 = 16 Current = 16
Advanced power management level: 128 (0x80)
Recommended acoustic management value: 254, current value: 254
DMA: mdma0 mdma1 mdma2 udma0 udma1 udma2 udma3 udma4 *udma5
Cycle time: min=120ns recommended=120ns
PIO: pio0 pio1 pio2 pio3 pio4
Cycle time: no flow control=240ns IORDY flow control=120ns
Commands/features:
Enabled Supported:
* READ BUFFER cmd
* WRITE BUFFER cmd
* Host Protected Area feature set
* Look-ahead
Write cache
* Power Management feature set
Security Mode feature set
* SMART feature set
* FLUSH CACHE EXT command
* Mandatory FLUSH CACHE command
* Device Configuration Overlay feature set
* 48-bit Address feature set
* Automatic Acoustic Management feature set
* SET MAX security extension
* Advanced Power Management feature set
* DOWNLOAD MICROCODE cmd
* General Purpose Logging feature set
* SMART self-test
* SMART error logging
Security:
Master password revision code = 65534
supported
not enabled
not locked
frozen
not expired: security count
not supported: enhanced erase
80min for SECURITY ERASE UNIT.
Checksum: correct
sdparm --get=WCE
/dev/sda: ATA FUJITSU MHV2080B 0000
WCE 1
hdparm -A 1/0 can set/clear write cache, sdparm --set=WCE=0/1 always
gets an error:
sdparm --set=WCE=0 /dev/sda
/dev/sda: ATA FUJITSU MHV2080B 0000
change_mode_page: failed setting page: Caching (SBC)
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