can't recognize the harddisk size

Tom H tomh0665 at gmail.com
Sun Apr 21 07:48:59 UTC 2013


On Sun, Apr 21, 2013 at 3:35 AM, Tom H <tomh0665 at gmail.com> wrote:
> On Sun, Apr 21, 2013 at 2:34 AM, Basil Chupin <blchupin at iinet.net.au> wrote:
>> On 21/04/13 11:03, Doug wrote:
>>> 2013/4/20 Tom H <tomh0665 at gmail.com <mailto:tomh0665 at gmail.com>>
>>>>
>>>> AFAIK 2TB is at the limit for an msdos-labelled disk and using a
>>>> gpt-label might be better (CAN SOMEONE CONFIRM - OR INFIRM - THIS?)
>>>> but I think that your problem comes from the kernel no knowing about
>>>> the partition that you've created.
>>
>> I have 2 external 2TB HDDs and I have had no hassles with formatting them.
>> All I did was use gparted (contained in the SystemRescueCD - and essential
>> tool) to format the drives.
>
> You can also format a 3 TB disk with an msdos label and end up with at
> most and more or less 2 TB. I was hoping that someone would know the
> exact limit.
>
> A former colleague tells me that it's 2 TiB; that rings a bell...

Found in some old notes (!):

The maximum number of sectors that can be addressed by an
msdos-labeled disk's MBR is 2^32. Since a disk's sector size is
generally 512 bytes, the maximum disk size is (2^32)*(2^9) bytes so 2
TiB.




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