[ubuntu-uk] EXT3 or EXT4

[Rob Beard]

On 16/07/10 21:09, Tony Travis wrote:
> On 16/07/10 20:53, Rob Beard wrote:
>> [...]
>> Now at the moment I've got my drive formatted to EXT3, I gather I can
>> convert from EXT3 to EXT4 (but I'm going to reformat the drive anyway)
>> but I wondered basically if I might be better going for EXT4 this time?
>
> Hello, Rob.
>
> Yes, you can convert from ext3 to ext4, but you do not get 'extents' for
> the existing files. Extents are one of the major advantages of ext4, so
> I would definitely reformat your drive instead of converting.
>
> Another advantage of ext4 is it's a lot quicker to fsck filesystems.
>

Is the Extents where it allocates space for big files?  (I found 
something about this when googling about EXT4).

I wonder too if it's possible to go back to EXT3 from EXT4 like it is 
possible to go back from EXT3 to EXT2 (how I understand it, EXT3 is EXT2 
with journalling).

Ta,

Rob