www.ATConsultancy.nl
Atmission CD pict
 
 

Home

Download

Introduction

News

Preserve data

FAQ

  

   SourceForge.net Logo

Preserve data

When using the ATmission Live CD, all modifications issued to the filesystem on the CD are stored by the cowloop driver in a so-called cowfile. By default, this cowfile is located in a writable filesystem in RAM. This implies that all modifications are lost as soon as you reboot your system.

With the power and versatility of the cowloop driver, it is easy to preserve your session data in a cowfile on a USB memory stick or on a hard disk.

Procedure

Preserving data is very simple. Just follow these steps:
  • Create a file, called saved.cow in the root directory of a FAT/FAT32/NTFS/ext2/ext3 filesystem (on USB memory stick or hard disk).
    1. On a Linux system you could use the command dd to create a file with a size of e.g. 64 Mbytes:

         dd if=/dev/zero of=/saved.cow bs=1M count=64

    2. On Windows you could take a large file (>32 MB) and copy it to c:\saved.cow
      Copy the file multiple times to create a larger file. In the DOS command prompt, type e.g.:

         copy a-big-file+another-big-file c:\saved.cow

      The ATmission CD-rom contains a script named Setup_Savefile.bat that provides an automated way to create a saved.cow file.

    3. Alternatively: download one of the saved.cow zip files below and extract the saved.cow file to the root directory of your hard disk or USB stick.

  • Make sure the device where the saved.cow resides is available when the ATmission Live CD is booted.
  • When ATmission boots, it checks if a file called saved.cow can be found in the root directory of your harddisk or USB memory stick. If such a file is present, it is mounted as an ext2 filesystem.

After finishing these preparations, insert the ATmission CD in your CD-ROM drive and boot from it.

You can specify the name of the cowfile on the boot prompt. When the boot screen with the numbers 1-3 appears, type the number and add cowsave=XXXXX, where XXXX is the name of your cowsave file. E.g.

1 cowsave=mycow

You cannot specify the device name, so the first file found with that name will be used.

To prevent the boot process to pick up a saved.cow file, add

nocowsave

to the boot prompt.

Downloadable saved.cow zip files

NameCowfile sizeDownload size
32-M-saved-cow.zip32 Mbytes32 Kbytes
64-M-saved-cow.zip64 Mbytes64 Kbytes
128-M-saved-cow.zip128 Mbytes128 Kbytes
256-M-saved-cow.zip256 Mbytes255 Kbytes
512-M-saved-cow.zip512 Mbytes509 Kbytes
1-G-saved-cow.zip1 Gbytes1018 Kbytes
2-G-saved-cow.zip2 Gbytes2 Mbytes
2.5-G-saved-cow.zip2.5 Gbytes2.5 Mbytes

Warning

Be very careful.
If you do have a file called saved.cow and you start the ATmission CD, this file will be used.
This could result in data loss if the file saved.cow contains valuable data for other applications.

© AT Consultancy bv, Nijmegen, The Netherlands  -  www.ATConsultancy.nl
© AT Computing bv, Nijmegen, The Netherlands  -  www.ATComputing.nl - www.ATComputing.net