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This line specifies that the floppy diskette be mounted by default into /media/ floppy The auto parameter specifies that the system detect the file system of the media automatically Therefore, you can simply enter mount /dev/fd0 at the shell prompt and the floppy will be automatically mounted using these parameters You can also implement a service called autofs on your system to help you with mounting removable media When configured and running, it will automatically detect when a diskette or other removable media has been inserted and mount it for you Configuring this service goes beyond the scope of this course and isn t required for your Linux+ exam, so we re not going to cover it here
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6: Managing the Linux File System
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FIGURE 6-42
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Before you remove a mounted floppy diskette from a drive, you must also unmount it Just as with partitions, this is done using the umount command To unmount a floppy, you enter umount device or umount mount_point For example, to unmount your A: drive, you would enter umount /dev/fd0 Let s next discuss mounting optical drives
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Just like partitions or floppy diskettes, you must also mount optical drives, such as CDs or DVDs, before you can use them The only real difference is the mount point used and the file system type For CDs and DVDs, you can use the file system type of iso9660 with the mount command On distributions such as SUSE Linux, you mount CDs in one of the three following directories:
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On distributions such as Red Hat or Fedora, your directories for mounting optical devices are located in /mnt
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Use Removable Media
FIGURE 6-43
Mounting a CD
To mount a CD on a Linux system, insert it in your CD drive Change to your root account and then enter mount t iso9660 device mount_point For example, if your CD drive is /dev/hdc and you want to mount the disc into /media/cdrom, you would enter mount t iso9660 /dev/hdc /media/cdrom This is shown in Figure 6-43 As with floppies, you can make the mounting process for optical devices easier by adding an entry to your /etc/fstab file Consider the following:
/dev/hdc /media/cdrom iso9660 noauto,user,sync 0 0
Adding this line makes it such that you only need to enter mount /dev/hdc to mount an optical device As with any mounted file system, you should use umount to unmount a CD or DVD before ejecting it Let s next discuss mounting external storage devices
Working with USB and FireWire Devices
Most Linux distributions are compatible with external storage devices using a USB or FireWire interface Because Linux is plug-n-play compatible, it should automatically detect a new device when you connect an external storage device (such as a flash drive or an external hard drive)
6: Managing the Linux File System
Most Linux distributions will address these devices as a SCSI device If you re using a system that uses only IDE internal drives, then your external device should be addressed through /dev/sda If you already have SCSI devices in your system, then it will be addressed as the last SCSI device in your system For example, if you have a SCSI hard drive and a SCSI DVD drive, then your external USB or FireWire device will be /dev/sdc To verify this, you can check your /var/log/messages file after connecting the device You should see a kernel message indicating that a new SCSI disk was attached In Figure 6-44, a USB flash drive has been connected to the system at /dev/sdd, indicating that it is the fourth SCSI device in the system If necessary, you can then use the same procedure discussed previously to create a partition on the device and then create a file system If a file system has already been created on the device, you only need to mount it You mount USB or FireWire devices in the same way that you mount a typical hard disk partition One issue that comes up here is that you may not be entirely sure what file system is being used on the external device, especially if the drive is being used among several different computers with different operating systems Because of this, I highly recommend that you use the t auto option with the mount command This will cause mount to try to detect for you what file system has been used on the device Other than that, mounting a USB or FireWire device is relatively easy Simply enter mount t auto device mount_point For example, if I wanted to mount an external flash drive that is the fourth SCSI device in the system in the /media/THUMBDRIVE directory, I would enter mount t auto /dev/sdd /media/ THUMBDRIVE This is shown in Figure 6-45
FIGURE 6-44
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