FreeBSD identifies various types of hard disks and drives with following naming convention
ad ATAPI (IDE) disk
da SCSI direct access disk
acd ATAPI (IDE) CDROM
cd SCSI CDROM
fd Floppy disk
To know the hardware detected by the kernel at boot time refer the file /var/run/dmesg.boot or use the command dmesg. The various hard disks and drives detected by the FreeBSD kernel can be determined with the help of either of the following commands
dmesg | egrep ‘^ad[0-9]|^da[0-9]’
(or)
egrep ‘^ad[0-9]|^da[0-9]’ /var/run/dmesg.boot
Eg1: $ egrep ‘^ad[0-9]|^da[0-9]’ /var/run/dmesg.boot
ad0: 476940MB <WDC WD5000AADS-00L4B1 05.04C05> at ata0-master SATA300
ad0: 976773168 sectors [969021C/16H/63S] 16 sectors/interrupt 1 depth queue
da0 at umass-sim0 bus 0 target 0 lun 0
da0: <Imation Atom PMAP> Removable Direct Access SCSI-0 device
da0: Serial Number \^_
da0: 40.000MB/s transfers
da0: 3820MB (7823360 512 byte sectors: 255H 63S/T 486C)
ad0: Intel check1 failed
ad0: Adaptec check1 failed
ad0: LSI (v3) check1 failed
ad0: LSI (v2) check1 failed
ad0: FreeBSD check1 failed
To determine the info about ATA disks, there exists a command utility atacontrol.
Eg 2: atacontrol list
ATA channel 0:
Master: ad0 <WDC WD5000AADS-00L4B1/05.04C05> Serial ATA II
Slave: no device present
ATA channel 1:
Master: no device present
Slave: no device present
ATA channel 2:
Master: no device present
Slave: no device present
ATA channel 3:
Master: no device present
Slave: no device present
Eg3: atacontrol info ata0
Master: ad0 <WDC WD5000AADS-00L4B1/05.04C05> Serial ATA II
Slave: no device present
If you need further assistance, please do not hesitate to contact us.
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