External USB Drives in Linux: Difference between revisions
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Adding external USB drives in Linux is easy. Etch uses hotplug to detect it. Using dmesg you can find out what mountpoint it is (Linux creates a SCSI device to mount to /dev/sdb and the drive will probably be /dev/sdb1). | Adding external USB drives in Linux is easy. Etch uses hotplug to detect it. Using dmesg you can find out what mountpoint it is (Linux creates a SCSI device to mount to /dev/sdb and the drive will probably be /dev/sdb1). | ||
/proc/bus/usb/devices shows you information about the connected USB device. | /proc/bus/usb/devices shows you information about the connected USB device. | ||
Most USB devices are formatted FAT32 which has a file size limit of 4GB. Because I'm using mine for Netvault backups and the virtual library media is created at sizes much larger than that, there are 2 choices: | Most USB devices are formatted FAT32 which has a file size limit of 4GB. Because I'm using mine for Netvault backups and the virtual library media is created at sizes much larger than that, there are 2 choices: | ||
ntfs-3G (which Etch doesn't support) and ext3 (which etch does). | ntfs-3G (which Etch doesn't support) and ext3 (which etch does). | ||
Format to ext3 using | Format to ext3 using | ||
mke2fs -T ext3 /dev/sdb1 | mke2fs -T ext3 /dev/sdb1 | ||
Then create an /etc/fstab entry | Then create an /etc/fstab entry | ||
and mount | and mount | ||
Test the (unmounted) disk for bad blocks using | Test the (unmounted) disk for bad blocks using | ||
badblocks -c 10240 -s -w -t random -v /dev/sdb | badblocks -c 10240 -s -w -t random -v /dev/sdb | ||
In order to encrypt the whole disk I used this tutorial [http://www.hermann-uwe.de/blog/howto-disk-encryption-with-dm-crypt-luks-and-debian.] | In order to encrypt the whole disk I used this tutorial [http://www.hermann-uwe.de/blog/howto-disk-encryption-with-dm-crypt-luks-and-debian.] | ||
apt-get install cryptsetup hashalot | apt-get install cryptsetup hashalot | ||
cfdisk /dev/sdb (if you still need to partition the disk, unlikely though) | cfdisk /dev/sdb (if you still need to partition the disk, unlikely though) | ||
cryptsetup --verbose --verify-passphrase luksFormat /dev/sdb1 | cryptsetup --verbose --verify-passphrase luksFormat /dev/sdb1 | ||
Open the encrypted device and assign it to a virtual /dev/mapper/YOURNAME device: | Open the encrypted device and assign it to a virtual /dev/mapper/YOURNAME device: | ||
cryptsetup luksOpen /dev/sdb1 YOURNAME | cryptsetup luksOpen /dev/sdb1 YOURNAME | ||
mkfs.ext3 -m 1 -O dir_index,filetype,sparse_super /dev/mapper/YOURNAME | mkfs.ext3 -m 1 -O dir_index,filetype,sparse_super /dev/mapper/YOURNAME | ||
To mount | To mount | ||
mount /dev/mapper/YOURNAME /mnt/ | mount /dev/mapper/YOURNAME /mnt/ | ||
Now it's transparently encrypted | Now it's transparently encrypted | ||
To unmount | To unmount | ||
umount /mnt/YOURNAME | umount /mnt/YOURNAME | ||
cryptsetup luksClose /dev/mapper/YOURNAME | cryptsetup luksClose /dev/mapper/YOURNAME | ||
Revision as of 14:15, 29 August 2007
Adding external USB drives in Linux is easy. Etch uses hotplug to detect it. Using dmesg you can find out what mountpoint it is (Linux creates a SCSI device to mount to /dev/sdb and the drive will probably be /dev/sdb1).
/proc/bus/usb/devices shows you information about the connected USB device.
Most USB devices are formatted FAT32 which has a file size limit of 4GB. Because I'm using mine for Netvault backups and the virtual library media is created at sizes much larger than that, there are 2 choices:
ntfs-3G (which Etch doesn't support) and ext3 (which etch does).
Format to ext3 using
mke2fs -T ext3 /dev/sdb1
Then create an /etc/fstab entry
and mount
Test the (unmounted) disk for bad blocks using
badblocks -c 10240 -s -w -t random -v /dev/sdb
In order to encrypt the whole disk I used this tutorial [1]
apt-get install cryptsetup hashalot
cfdisk /dev/sdb (if you still need to partition the disk, unlikely though)
cryptsetup --verbose --verify-passphrase luksFormat /dev/sdb1
Open the encrypted device and assign it to a virtual /dev/mapper/YOURNAME device:
cryptsetup luksOpen /dev/sdb1 YOURNAME
mkfs.ext3 -m 1 -O dir_index,filetype,sparse_super /dev/mapper/YOURNAME
To mount
mount /dev/mapper/YOURNAME /mnt/
Now it's transparently encrypted
To unmount
umount /mnt/YOURNAME
cryptsetup luksClose /dev/mapper/YOURNAME