Making a virtual ext3fs! need help

evrgreen · 07-20-2009, 07:57 PM

Hey I want to make a virtual ext3 fs similar to the way you can with ntfs on a linux machine

example with ntfs

Code:

mkfs.ntfs -F <non-block file> <sectors>

I'm not sure if it can be done I hope so...

unSpawn · 07-20-2009, 09:09 PM

Yes you can.

linus72 · 07-20-2009, 09:15 PM

that's basically what ubuntu does here
( https://help.ubuntu.com/community/LiveCD/Persistence )

Quote:

Creating the "casper-rw" File System

Formatting your USB Stick is also a very simple task. First we will unmount the device so we can format it, then just format it.

First unmount your USB Stick by running the following command:

sudo umount /dev/sda1

Now that your USB Stick is unmounted we can format it. The only special consideration is that we must give the formatted partition the label “casper-rw”. This is the name the Live CD looks for to store persistent information. You can properly format your USB Stick by issuing the following command:

sudo mkfs.ext3 -b 4096 -L casper-rw /dev/sda1

The output of this command should look something like this:

mke2fs 1.38 (30-Jun-2005)
Filesystem label=casper-rw
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
31744 inodes, 31740 blocks
1587 blocks (5.00%) reserved for the super user
First data block=0
1 block group
32768 blocks per group, 32768 fragments per group
31744 inodes per group

Writing inode tables: done
Creating journal (1024 blocks): done
Writing superblocks and filesystem accounting information: done

This filesystem will be automatically checked every 20 mounts or
180 days, whichever comes first. Use tune2fs -c or -i to override.

NOTE: This example uses the ext3 file system, but almost any file system should work. Among the file systems which won't work are VFAT and NTFS

or do you mean a qemu-img ??