hdd shows wrong size

I’m a bit confused:
After living with my 80 Gb hdd for a long time it was time for something bigger. I bought an 1Tb WD10EADS Hard drive and mounted it to /home/save after formating it with ext3.
But wenn I do

ava@linux-u5eo:/home/save> df -h
Dateisystem          Größe Benut  Verf Ben% Eingehängt auf
/dev/sdb2              20G  5,4G   14G  29% /
udev                  752M  628K  751M   1% /dev
/dev/mapper/cr_sdb3    52G  197M   49G   1% /home
**/dev/mapper/cr_sda1   917G  200M  871G   1% /home/save**
/dev/sr0              4,4G  4,4G     0 100% /media/SU1110.001

it shows less than 90% usable.Ok I know about the difference between “Hdd-Manufacturers Gb” and “System Gb” but this can’t be the reason here. Is this maybe due to the fact that I use an encrypted Partition? I have never written anything to this drive till now.

linux-u5eo:/home/save # fdisk -l /dev/sda

Platte /dev/sda: 1000.2 GByte, 1000204886016 Byte
255 Köpfe, 63 Sektoren/Spuren, 121601 Zylinder
Einheiten = Zylinder von 16065 × 512 = 8225280 Bytes
Disk identifier: 0x000b0d18

   Gerät  boot.     Anfang        Ende     Blöcke   Id  System
/dev/sda1               2      121601   976752000   83  Linux

thank you for your help!

You have 5% automatically reserved to ext3 root user for logs, temporary files etc. (and to prevent fragmentation of the drive if you consider that a bonus)

man tune2fs if you want to change this number for some reason.

Ah ok, i read that when I googled this proplem-but I thought this whould only apply to system partitions and not to additional drives…
it is still sad to loose 130 Gb in total, but sure there is a reason why the developers have arranged it that way :stuck_out_tongue:

Yes, but on such a big disk you could have much less then 130 Gb. IMHO you can reduce this to 30 Gb wthout any problem.

I do not know this works in ext3, but on some fs types an almost full partition will show performance degredation.