29 Jun
2009
29 Jun
'09
5:46 p.m.
How can I delete or completely erase a partition-table.
The feature "delete partitiontable" is removed in the opensuse partitioning
tool.
Thanks, Hans
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29 Jun
29 Jun
6:05 p.m.
On Mon, Jun 29, 2009 at 6:46 PM, Hans de Faber<hans.defaber(a)gmail.com> wrote:
How can I delete or completely erase a
partition-table.
The feature "delete partitiontable" is removed in the opensuse partitioning
tool.
Thanks, Hans
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The typical PC partition table is in the very first sector of the drive, so:
dd if=/dev/zero of=/dev/sdx count=1
should do it, but you may need to reboot to get the kernel to reread
it. I'm sure there's another way, but I don't know it.
I won't explain sdx because if you don't know what to put there, you
should not be using this command.
Greg
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6:48 p.m.
On Monday June 29 2009, Greg Freemyer wrote:
On Mon, Jun 29, 2009 at 6:46 PM, Hans de Faber wrote:
The kernel manages all I/O (even when you access a disk via its
/dev entry, not just via files), so any buffered disk blocks it has will
remain consistent when you write.
However, if you have any mounted file system volumes on that drive,
you should unmount them first, lest unpredictable and undesirable
consequences ensue.
How can I delete or completely erase a
partition-table.
The feature "delete partitiontable" is removed in the opensuse
partitioning tool.
Thanks, Hans
The typical PC partition table is in the very first sector of the
drive, so:
dd if=/dev/zero of=/dev/sdx count=1
should do it, but you may need to reboot to get the kernel to reread
it. ... Greg
Randall Schulz
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30 Jun
30 Jun
6:55 a.m.
Randall R Schulz schreef:
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On Monday June 29 2009, Greg Freemyer wrote:
Thanks,this was the solution.
Most of the time I do this kind of actions with linux based on CD.(knoppix)
Have a nice day, Hans
On Mon, Jun
29, 2009 at 6:46 PM, Hans de Faber wrote:
The kernel manages all I/O (even when you access a disk via its
/dev entry, not just via files), so any buffered disk blocks it has will
remain consistent when you write.
However, if you have any mounted file system volumes on that drive,
you should unmount them first, lest unpredictable and undesirable
consequences ensue.
How can I delete or completely erase a
partition-table.
The feature "delete partitiontable" is removed in the opensuse
partitioning tool.
Thanks, Hans
The typical PC partition table is in the very first sector of the
drive, so:
dd if=/dev/zero of=/dev/sdx count=1
should do it, but you may need to reboot to get the kernel to reread
it. ... Greg
Randall Schulz
6:58 a.m.
On Mon, Jun 29, 2009 at 7:48 PM, Randall R Schulz<rschulz(a)sonic.net> wrote:
On Monday June 29 2009, Greg Freemyer wrote:
True, but irrelevant.
The kernel maintains a list of partition tables in ram. (/proc/partitions)
Doing behind the scenes updates to /dev/sdx has no impact on those ram
based tables. Try it.
cat /proc/partitions
dd ...
cat /proc/partitions
You have to tell the kernel to update its tables from disk after you
update the disk. I just don't remember how to do that offhand, so I
said a reboot will definitely do it.
Greg
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On Mon, Jun 29, 2009 at 6:46 PM, Hans de Faber
wrote:
The kernel manages all I/O (even when you access a disk via its
/dev entry, not just via files), so any buffered disk blocks it has will
remain consistent when you write. How can I delete or completely erase a
partition-table.
The feature "delete partitiontable" is removed in the opensuse
partitioning tool.
Thanks, Hans
The typical PC partition table is in the very first sector of the
drive, so:
dd if=/dev/zero of=/dev/sdx count=1
should do it, but you may need to reboot to get the kernel to reread
it. ... 
8:35 a.m.
On Tue, 30 Jun 2009, Greg Freemyer wrote:-
> On Monday June 29 2009, Greg Freemyer wrote:
>> The typical PC partition table is in the very
first sector of the
>> drive, so:
>>
>> dd if=/dev/zero of=/dev/sdx count=1
>>
>> should do it, but you may need to reboot to get the kernel to reread
>> it. ...
You can also use fdisk /dev/sdx
Then use option 'o' to create the empty partition table, and write it
out using 'w'. This way, as long as there are no mounted partitions on
/dev/sdx, the kernel will reread the partition table as fdisk exits.
You have to tell the kernel to update its tables from
disk after you
update the disk. I just don't remember how to do that offhand, so I
said a reboot will definitely do it.
Either of these will do it:
hdparm -z /dev/sdx
blockdev --rereadpt /dev/sdx
provided that there are no partitions mounted on /dev/sdx. If there are,
you need to umount them before trying to reread the partition table or
you'll get a "BLKRRPART: Device or resource busy" error.
Regards,
David Bolt
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11:12 a.m.
In <87f94c370906291605t2d184e8du9ff3d2771211fc01(a)mail.gmail.com>om>, Greg
Freemyer wrote:
On Mon, Jun 29, 2009 at 6:46 PM, Hans de
Faber<hans.defaber(a)gmail.com>
wrote:
> How can I delete or completely erase a
partition-table.
I believe gparted can write an *empty* partition table of many types, but I
don't believe it has support for writing an invalid partition table.
The typical PC partition table is in the very first
sector of the drive,
so:
dd if=/dev/zero of=/dev/sdx count=1
That will also destroy your MBR. :(
should do it, but you may need to reboot to get the
kernel to reread
it. I'm sure there's another way, but I don't know it.
blockdev --rereadpt /dev/sdx
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1 Jul
1 Jul
4:57 p.m.
Hello,
On Tue, 30 Jun 2009, Boyd Stephen Smith Jr. wrote:
In
<87f94c370906291605t2d184e8du9ff3d2771211fc01(a)mail.gmail.com>om>, Greg
Freemyer wrote:
Of what use is a MBR without partitions? Anyway:
dd if=/dev/zero of=/dev/sdx bs=1 count=64 seek=446
On files (images) you need to add 'conv=notrunc'.
-dnh
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dd if=/dev/zero of=/dev/sdx count=1
That will also destroy your MBR. :(
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7 comments
6 participants
participants (6)
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Boyd Stephen Smith Jr. -
David Bolt -
David Haller -
Greg Freemyer -
Hans de Faber -
Randall R Schulz