Syntax

The general syntax is as follows:
mount /dev/adXYZE /path/to/mount/point
Where,

• /dev/adXZE is actual disk partition name.

Mounting a hard disk on FreeBSD

Use the following command to list all detected hard disks including cdrom and partitions:

egrep 'ad[0-9]|cd[0-9]' /var/run/dmesg.boot

Sample outputs:

ad0: 5120MB  at ata0-master WDMA2
acd0: CDROM  at ata1-master WDMA2
Trying to mount root from ufs:/dev/ad0s1a
ad0: 5120MB  at ata0-master WDMA2
acd0: CDROM  at ata1-master WDMA2
Trying to mount root from ufs:/dev/ad0s1a
ad0: 5120MB  at ata0-master WDMA2
acd0: CDROM  at ata1-master WDMA2
Trying to mount root from ufs:/dev/ad0s1a
ad0: 5120MB  at ata0-master WDMA2
acd0: CDROM  at ata1-master WDMA2
Trying to mount root from ufs:/dev/ad0s1a

The following provides much cleaner output:
# atacontrol list
Sample outputs:

ATA channel 0:
    Master:  ad0  ATA/ATAPI revision 7
    Slave:       no device present
ATA channel 1:
    Master: acd0  ATA/ATAPI revision 4
    Slave:       no device present

On modern FreeBSD server use camcontrol command instead:
# camcontrol devlist
Sample outputs:

    at scbus0 target 0 lun 0 (ada0,pass0)
    at scbus1 target 0 lun 0 (ada1,pass1)

FreeBSD mounting commands

To mount a partition called /dev/ad1s1d at /data, create an empty directory using mkdir command:

mkdir /data

To mount device /dev/ad1s1d on /data/ directory, type:

mount /dev/ad6s1d  /data

Verify new mounted file system either with df command or mount command:

mount
df -h

How do I automatically mount on boot up?

Edit /etc/fstab and append entry as follows so that /dev/ad6s1d get mounted automatically when FreeBSD boots:

/dev/ad6s1d     /data       ufs     rw           2       2

Save and close the file.

Unmount a filesystem on FreeBSD

Use umount command as follows for un mounting an device mounted at /data/:

umount /data/
### verification ##
df -H
mount