Howto remove partitions ?

[sympton]

Hi

Just upgraded from 7 to 8 .. I got 2 2tb hdd,s and another had freenas7 on it, so it has few partitions on it. I would like to remove these partitions and make whole disk available for storage. However:

Code:

freenas# fdisk ada0
******* Working on device /dev/ada0 *******
parameters extracted from in-core disklabel are:
cylinders=3876021 heads=16 sectors/track=63 (1008 blks/cyl)

Figures below won't work with BIOS for partitions not in cyl 1
parameters to be used for BIOS calculations are:
cylinders=3876021 heads=16 sectors/track=63 (1008 blks/cyl)

fdisk: invalid fdisk partition table found
Media sector size is 512
Warning: BIOS sector numbering starts with sector 1
Information from DOS bootblock is:
The data for partition 1 is:
sysid 165 (0xa5),(FreeBSD/NetBSD/386BSD)
    start 63, size 3907029105 (1907729 Meg), flag 80 (active)
        beg: cyl 0/ head 1/ sector 1;
        end: cyl 180/ head 15/ sector 63
The data for partition 2 is:
<UNUSED>
The data for partition 3 is:
<UNUSED>
The data for partition 4 is:
<UNUSED>
freenas#

and

Code:

freenas# fsck_ufs ada0
** /dev/ada0
Cannot find file system superblock
ioctl (GCINFO): Inappropriate ioctl for device
fsck_ufs: /dev/ada0: can't read disk label
freenas#

Howdo i remove these partitions ?

At the very beginning i searched partitions by mounting them through web interface in freenas8, and afterwards that couldnt be done anymore, did disk corrupt ?

And in web interface when creatin volume, i see two times 1.8tb partition ada0 and ada1 ... shouldnt that be impossible with 2tb drive ?)

Thnx, Tomi

 

[sympton]

Suddenly, while i did NOTHING, i managed to mount ada0 drive. But still havent been able to destroy partitions..

 

[ProtoSD]

You might need to wipe it. GPT partitions store info at the beginning and end so you need to do a complete wipe to be safe. In your case you could do 'dd if=/dev/zero of=/dev/ad0 bs=512'

This isn't the same for everyone, the device name can be different, so pay attention or you could wipe the wrong disk if you're not careful. Someone else made a suggestion about a way to do just the beginning and end of the disk, but I don't have that link right now. I can update later if I find it.

 

[HavaCuppaJoe]

Here's the link you're talking about, Proto.

http://forums.freenas.org/showthrea...-mount-root-from-quot-error&highlight=gpt+end