Hi!
I tried to make the partitions with Knoppix graphic QTparted before installing Slack 10.2
It's empty in Qtparted and it's empty in fdisk!
If I start Slack fdisk and try to create a partition it tells me its unable to write /dev/hdc...
Is there something i dont understand... ?!?

/dev/hdc is usually the cdrom drive.
hd=harddisk
c=place on the ide 'chain' (c is secondary master, usually cdrom drive)

Post the results of 'fdisk -l'

Ok my hardware config looks like this...
Motherboard Asus P5P800
one 80G pata-disk as master in first ideslot
one DVD-burner as master in second ideslot
one CD-player as slave in second ideslot
one 250G sata-disk in first sataport
It is the 250G sata disk i try to partion.
I diskconnected the 80G-disk first.
Knoppix tell me the 250Gdisk is /dev/hde and Slackware tells it is /dev/hdc...
I think Knoppix qtparted writes a partition-table at disk because if I restart the computer it read it again... but if I start Slackware it tells me I cant write at the disk but it shows no partitions...
How can I reset the disk as I normally do in windoz with delpart.exe ??

Or have I to do something in BIOS...???!???

post fdisk -lIt will help to see your actual setup

Ill do it asap... my kids are playing WOW through my server... ill have to wait until i can use it for myself...