Unable to write persistant files to HDD

[Ham13]

:( I'm running Knoppix 3.8 Live CD on a Win95 Pentium 200MHz pc. I have only 64 meg of ram.
I'm running in text mode to conserve memory. Trying to make a swapfile. The mkdosswap will not create it. See posting in Boot/Hardware problems - Unable to create swapfile. I've tried all recomendations and nothing works.

This is the sequence:

dd if=/dev/zero of=/mnt/hda1/swap bs=1M count=65

ls -l shows the swap file was created on /mnt/dev/hda1
it appears as though the file was created but I did not see any action on the HDD led.

When I reboot Knoppix in text mode the file is gone. ls -l now shows Total 0.

Why can't I write a file to the hard drive? /mnt/had1 is the fat32 partition is it not?

The docs with knoppix indicate that the knoppix.swp file can be deleted after terminating knoppix. Why can I not see this file under Windows? Where are the files I'm creating written if not to the HDD?

[malaire]

:( I'm running Knoppix 3.8 Live CD on a Win95 Pentium 200MHz pc. I have only 64 meg of ram.
I'm running in text mode to conserve memory. Trying to make a swapfile. The mkdosswap will not create it. See posting in Boot/Hardware problems - Unable to create swapfile. I've tried all recomendations and nothing works.

This is the sequence:

dd if=/dev/zero of=/mnt/hda1/swap bs=1M count=65

ls -l shows the swap file was created on /mnt/dev/hda1
it appears as though the file was created but I did not see any action on the HDD led.

When I reboot Knoppix in text mode the file is gone. ls -l now shows Total 0.

Why can't I write a file to the hard drive? /mnt/hda1 is the fat32 partition is it not?

The docs with knoppix indicate that the knoppix.swp file can be deleted after terminating knoppix. Why can I not see this file under Windows? Where are the files I'm creating written if not to the HDD?

/mnt/hda1 "is" the fat32 partition only after you have mounted the partition. Before that it's just a normal directory and everything you put there will disappear when you reboot.

So what you need to do is:


mount /dev/hda1 /mnt/hda1
dd if=/dev/zero of=/mnt/hda1/knoppix.swp bs=1M count=65
sync
umount /mnt/hda1

Explanation:
1. mount-command makes the hda1-partition available at /mnt/hda1 directory
2. dd creates the swapfile.
3. sync-command waits until that file has been fully written to the HD.
4. umount-command "unmounts" the hda1-partition so that you can reboot safely.

[Ham13]

:D Thanks for the reply malaire. I have succeded in writing to the HDD. The Knoppix boot routine must not mount /dev/hda1. This may be why mkdosswap failed.


Now I have a 256M file named knoppix.swp. From the FAQ the folling commands will make the swap file accessable:

mkswap /mnt/hda1/knoppix.swp

edit /etc/fstab to include /mnt/hda1/knoppix.swp swap swap defaults 0 0

swapon -a

Is this correct. The file should show up in /proc/swaps.

Should I use swapoff or reboot after this sequence?

As /etc/fstab is rebuilt on boot up any edits will be lost. Should I edit this file anyway?

Any other hints?

Thanks

[malaire]

Now I have a 256M file named knoppix.swp. From the FAQ the folling commands will make the swap file accessable:

mkswap /mnt/hda1/knoppix.swp
edit /etc/fstab to include /mnt/hda1/knoppix.swp swap swap defaults 0 0
swapon -a

Is this correct. The file should show up in /proc/swaps.

Might be OK, but I'm not 100% sure as I don't usually edit /etc/fstab at all.

Instead of editing /etc/fstab and using swapon -a you can use swapon /mnt/hda1/knoppix.swp without editing /etc/fstab.



Should I use swapoff or reboot after this sequence?

It might be nice to use swapoff, but I don't know if that is strictly needed.
It you don't use it, and the swapfile somehow gets corrupted, you can allways run mkswap again to fix that. (But I don't know if such corruption is possible at all.)



As /etc/fstab is rebuilt on boot up any edits will be lost. Should I edit this file anyway?

I'd recommend using swapon /mnt/hda1/knoppix.swp so you don't need to edit /etc/fstab.