[nSLUG] Hard Disk question

J. Paul Bissonnette jpaulb at eastlink.ca
Fri Mar 7 11:21:17 AST 2008



Dop Ganger wrote:
> On Fri, 7 Mar 2008, J. Paul Bissonnette wrote:
>
>   
>> jpb at maple:~$ sudo fdisk -l /dev/hdd
>>
>> Disk /dev/hdd: 80.0 GB, 80026361856 bytes
>> 255 heads, 63 sectors/track, 9729 cylinders
>> Units = cylinders of 16065 * 512 = 8225280 bytes
>> Disk identifier: 0x00014e08
>>
>>   Device Boot      Start         End      Blocks   Id  System
>> /dev/hdd1               1        9729    78148161   83  Linux
>>     
>
> That certainly looks reasonable; 9729 cylinders, and /dev/hdd1 starts at 1
> and ends at 9729. Try:
>
> mke2fs -b 4096 -N 1024 -m 0 /dev/hdd1
>
> This will format /dev/hdd1 as ext2fs with options to use as little space
> as possible for filesystem overhead (and as a result will be fairly
> unusable - only 1024 inodes will not get you too far these days). Mount it
> and if the partition table is correct you should see somewhere between 70
> and 80 gig free.
>
>   
I used gparted and ended up with about 75GB of space. The disk is usable 
again.

>> The disk was partitioned with only one partition, it is being used as a
>> temporary storage  - scratch pad. Anything important that was on that
>> disk is stored to removable media. When it is deleted I want it cleaned.
>> rm doesn't do much of a job of removing files, they are recoverable.
>>     
>
> If you're concerned about someone picking off files, don't fill the 
> partition, fill the drive:
>
> dd if=/dev/zero of=/dev/hdd bs=64M
>
> Recreate and reformat the partition and you're good to go. Filling up the 
> partition itself doesn't work because you can still have data hiding in 
> the directory structure, packed tails, etc.
>
> In theory someone could still use a scanning tunnelling microscope to pull 
> data off but it's usually not a concern in practice.
>   
Not that paranoid, just rather not have my erased love letters  with 
Lady D  land in the hands of Lord D :)
> Cheers... Dop.
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>   



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