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computing:storage:disk_images

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computing:storage:disk_images [2012/12/10 11:28]
gcooper 		computing:storage:disk_images [2019/10/25 09:02] (current)
gcooper
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-====== Working with Disk Images ======+====== Working with Disk Images in Linux ======
  
-See also: [[computing:storage:backup_cf_ssh|Backing Up Your Compact Flash Using SSH]]+See also: **[[computing:backup:backup_cf_ssh|Backing Up Your Compact Flash Using SSH]]**
  
 ===== RSYNC To Download ISO Images ===== ===== RSYNC To Download ISO Images =====
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 </file> </file>
  
-==== View Disk Partitions ====+===== View Disk Partitions =====
  
 To view disk and USB pen drive partitions, log in as root and enter. To view disk and USB pen drive partitions, log in as root and enter.
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 Floppy Images Floppy Images
  
-==== Create an image of a floppy disk ====+===== Create an image of a floppy disk =====
  
 <file> <file>
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 </file> </file>
  
-==== CD/DVD (ISO) Images ====+===== CD/DVD (ISO) Images =====
  
 To mount an ISO image To mount an ISO image
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 </file> </file>
  
-==== To make an ISO image from files on your hard drive ====+===== To make an ISO image from files on your hard drive =====
  
 Create a directory which holds the files you want. Then use the mkisofs command. Create a directory which holds the files you want. Then use the mkisofs command.
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 This results in a file called ''cd.iso'' in folder ''/tmp'' which contains all the files and directories in ''/some/directory/''. This results in a file called ''cd.iso'' in folder ''/tmp'' which contains all the files and directories in ''/some/directory/''.
  
-==== To verify an ISO image file to a CD disk ====+===== To verify an ISO image file to a CD disk =====
  
 Use the md5sum command. Note that a difference in the md5sums does NOT guarantee a failed burn, but if the md5sums are the same, it is most probably a good disk/image. To improve your chances of a successful disk-to-image comparison, be sure to fully erase CD/RW disks (not 'quick') and burn using 'disk at once' (DAO). Use the md5sum command. Note that a difference in the md5sums does NOT guarantee a failed burn, but if the md5sums are the same, it is most probably a good disk/image. To improve your chances of a successful disk-to-image comparison, be sure to fully erase CD/RW disks (not 'quick') and burn using 'disk at once' (DAO).
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 For more info, see the man pages for mkisofs, losetup, and dd, or see the CD-Writing-HOWTO at http://www.tldp.org. For more info, see the man pages for mkisofs, losetup, and dd, or see the CD-Writing-HOWTO at http://www.tldp.org.
  
-==== DVD (ISO) Images ====+===== DVD (ISO) Images =====
  
 You can back up a DVD (even a movie) to your hard drive and restore it easily from the Linux command line. You can back up a DVD (even a movie) to your hard drive and restore it easily from the Linux command line.
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 </file> </file>
  
-==== Compact Flash or USB Key ====+===== Compact Flash or USB Key =====
  
-=== Unmount the Filesystem ===+==== Unmount the Filesystem ====
  
 Many newer linux distributions will automatically mount flash media once it's been inserted. You may have to unmount the media first before imaging. If you see the flash card mounted on the desktop GUI, try right clicking on the icon and selecting "umount". Many newer linux distributions will automatically mount flash media once it's been inserted. You may have to unmount the media first before imaging. If you see the flash card mounted on the desktop GUI, try right clicking on the icon and selecting "umount".
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 You can usually determine the proper device name to use with ''fdisk -l'' or ''dmesg''. You probably need to be root (or use ''sudo'') for these commands. You can usually determine the proper device name to use with ''fdisk -l'' or ''dmesg''. You probably need to be root (or use ''sudo'') for these commands.
  
-=== Backup an Existing Device ===+==== Backup an Existing Device ====
  
 This command assumes you have a flash device ''/dev/sdf'' and you are logged in as a regular user, not root: This command assumes you have a flash device ''/dev/sdf'' and you are logged in as a regular user, not root:
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 </file> </file>
  
-=== Restore the Device ===+==== Restore the Device ====
  
 You might issue the following command as root to write an image onto the CF or USB key: You might issue the following command as root to write an image onto the CF or USB key:
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 Warning, if you are not sure where your CF device is, you could easily overwrite all data on another disk drive in your system! Warning, if you are not sure where your CF device is, you could easily overwrite all data on another disk drive in your system!
  
-==== DD Rescue ====+===== DD Rescue =====
  
 DD Rescue is a tool for disk data recovery. More info is [[computing:storage:data_recovery|here]]. DD Rescue is a tool for disk data recovery. More info is [[computing:storage:data_recovery|here]].
  
-==== DD Command ====+===== DD Command =====
  
 The dd command copies data from one place to another. Sometimes cat can do the same thing (with redirection), but dd has options to translate data, selectively copy only part of a data stream, and buffer its reads and writes. The dd command copies data from one place to another. Sometimes cat can do the same thing (with redirection), but dd has options to translate data, selectively copy only part of a data stream, and buffer its reads and writes.
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 Since dd can be easily used to munge a hard drive, it (hopefully) is a superuser-only tool. Since dd can be easily used to munge a hard drive, it (hopefully) is a superuser-only tool.
  
-=== Examples ===+==== Examples ====
  
-== Creating and Restoring a hard drive backup image ==+=== Creating and Restoring a hard drive backup image ===
  
 The main options to be concerned about are if= (input file) and of= (output file). By default, dd reads from stdin and writes to stdout. Here is an example of a use for dd: The main options to be concerned about are if= (input file) and of= (output file). By default, dd reads from stdin and writes to stdout. Here is an example of a use for dd:
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 </file> </file>
  
-==== Backing up your Master Boot Record (MBR) ====+===== Backing up your Master Boot Record (MBR) =====
  
 You should do this before you edit your partition table so that you can put it back if you mess things up. You should do this before you edit your partition table so that you can put it back if you mess things up.
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 </file> </file>
  
-==== Getting around file size limitations using split ====+===== Getting around file size limitations using split =====
  
 When making images, it's possible to run up against the operating system (filesystem) file size limitations. One way to work around a given file size limitation is to use the split command. When making images, it's possible to run up against the operating system (filesystem) file size limitations. One way to work around a given file size limitation is to use the split command.
computing/storage/disk_images.1355164134.txt.gz · Last modified: 2012/12/10 11:28 by gcooper

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