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[SRX] How to mount a USB disk and format it in the MS-DOS file system

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Article ID: KB22184 KB Last Updated: 19 Dec 2012Version: 2.0
Summary:
This article provides information on how to mount an USB disk to SRX and format it in the MS-DOS file system.
Symptoms:
How to mount an USB disk to SRX and format the MS-DOS file system and backup configurations.
Cause:
 
Solution:
  1. Before inserting the USB disk in the SRX device:
    root@SRX3400-A% ls /dev
    ad0 cuau0 fileassoc ptyp2 ttyu0.lock
    ad0s1 cuau0.init geom.ctl random ttyu1
    ad0s1a cuau0.lock i2c recb ttyu1.init
    ad0s1c cuau1 iic rosebud ttyu1.lock
    ad0s1e cuau1.init klog sfi_fifo0 ttyu2
    ad2 cuau1.lock kmem sfi_fifo1 ttyu2.init
    ad2s1 cuau2 log stderr ttyu2.lock
    ad2s1a cuau2.init md0 stdin ttyu3
    ad2s1b cuau2.lock md1 stdout ttyu3.init
    ad2s1c cuau3 mdctl tsec1 ttyu3.lock
    ad2s1e cuau3.init mem tsec2 urandom
    ad2s1f cuau3.lock nfs4 tsec3 usb
    ata devctl nfslock ttyp0 usb0
    bcm56214.0 devstat null ttyp1 usb1
    cfi0 fd pci ttyp2 veriexec
    console fido ptyp0 ttyu0 xpt0
    ctty fileassoc ptyp1 ttyu0.init zero

  2. After inserting the USB disk in the SRX device:
    root@SRX3400-A% ls /dev
    ad0 cuau0.init fileassoc random ttyu1.init
    ad0s1 cuau0.lock geom.ctl recb ttyu1.lock
    ad0s1a cuau1 i2c rosebud ttyu2
    ad0s1c cuau1.init iic sfi_fifo0 ttyu2.init
    ad0s1e cuau1.lock klog sfi_fifo1 ttyu2.lock
    ad2 cuau2 kmem stderr ttyu3
    ad2s1 cuau2.init log stdin ttyu3.init
    ad2s1a cuau2.lock md0 stdout ttyu3.lock
    ad2s1b cuau3 md1 tsec1 urandom
    ad2s1c cuau3.init mdctl tsec2 usb
    ad2s1e cuau3.lock mem tsec3 usb0
    ad2s1f da0 nfs4 ttyp0 usb1 < da0
    ata da0s1 nfslock ttyp1 veriexec < da0s1
    bcm56214.0 devctl null ttyp2 xpt0
    cfi0 devstat pci ttyu0 zero
    console fd ptyp0 ttyu0.init
    ctty fido ptyp1 ttyu0.lock
    cuau0 fileassoc ptyp2 ttyu1

  3. Format the USB disk as MS-DOS:
    root@SRX3400-A% newfs -T msdos /dev/da0s1
    /dev/da0s1: 957.0MB (1959864 sectors) block size 16384, fragment size 2048
    using 6 cylinder groups of 183.62MB, 11752 blks, 23552 inodes.
    super-block backups (for fsck -b #) at:
    32, 376096, 752160, 1128224, 1504288, 1880352

  4. Mount the USB disk:
    root@SRX3400-A% mount -t msdos /dev/da0s1 /mnt

  5. Un-mount the USB disk:
    root@SRX3400-A% df -h
    Filesystem Size Used Avail Capacity Mounted on
    /dev/ad0s1a 865M 451M 345M 57% /
    devfs 1.0K 1.0K 0B 100% /dev
    /dev/md0 514M 514M 0B 100% /junos
    /cf 865M 451M 345M 57% /junos/cf
    devfs 1.0K 1.0K 0B 100% /junos/dev/
    procfs 4.0K 4.0K 0B 100% /proc
    /dev/ad0s1e 96M 126K 88M 0% /config
    /dev/ad2s1f 12G 9.2G 1.7G 84% /var
    /dev/md1 998M 1.1M 917M 0% /mfs
    /var/jail 12G 9.2G 1.7G 84% /jail/var
    /var/log 12G 9.2G 1.7G 84% /jail/var/log
    devfs 1.0K 1.0K 0B 100% /jail/dev
    /dev/da0s1 946M 4.0K 870M 0% /mnt < usb mount to /mnt

    root@SRX3400-A% umount /mnt
    root@SRX3400-A% df -h
    Filesystem Size Used Avail Capacity Mounted on
    /dev/ad0s1a 865M 451M 345M 57% /
    devfs 1.0K 1.0K 0B 100% /dev
    /dev/md0 514M 514M 0B 100% /junos
    /cf 865M 451M 345M 57% /junos/cf
    devfs 1.0K 1.0K 0B 100% /junos/dev/
    procfs 4.0K 4.0K 0B 100% /proc
    /dev/ad0s1e 96M 126K 88M 0% /config
    /dev/ad2s1f 12G 9.2G 1.7G 84% /var
    /dev/md1 998M 1.1M 917M 0% /mfs
    /var/jail 12G 9.2G 1.7G 84% /jail/var
    /var/log 12G 9.2G 1.7G 84% /jail/var/log
    devfs 1.0K 1.0K 0B 100% /jail/dev
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