Partition 1 does not end on cylinder boundary

[Pandu Poluan]

(sorry for top-posting; Gmail mobile can reply *only* by top-posting)

IIRC, the CHS values reported by modern drives no longer match exactly
with the physical sector. So, if I were you, I'd just ignore the
warning.

CMIIW.

Rgds,



On 2011-02-24, Asif Iqbal <vadud3 at gmail.com> wrote:
> On Wed, Feb 23, 2011 at 3:37 PM, Nathan Stratton Treadway
> <ubuntu.lists at nathanst.com> wrote:
>> On Wed, Feb 23, 2011 at 13:15:14 -0500, Asif Iqbal wrote:
>>> I just installed lucid 64bit server and looks like /boot partition
>>> overlaps. I built few other
>>> lucid 64bit server. They all show the same overlap.
>>>
>>> # fdisk -l /dev/sda
>>>
>>> Disk /dev/sda: 146.0 GB, 145999527936 bytes
>>> 255 heads, 63 sectors/track, 17750 cylinders
>>> Units = cylinders of 16065 * 512 = 8225280 bytes
>>> Sector size (logical/physical): 512 bytes / 512 bytes
>>> I/O size (minimum/optimal): 512 bytes / 512 bytes
>>> Disk identifier: 0x0008911b
>>>
>>>    Device Boot      Start         End      Blocks   Id  System
>>> /dev/sda1   *           1          31      242688   83  Linux
>>> Partition 1 does not end on cylinder boundary.
>>> /dev/sda2              31       17750   142332928   8e  Linux LVM
>>
>> This listing doesn't show that they partitions actually _overlap_, only
>> that the "cylinder 31" is split between the two.  (Note that this
>> cylinder calculation is really just arbitrary, based on based on the
>> logical heads/sectors geometry assigned to the disk)
>>
>> Running "fdisk -l -u /dev/sda" should show you that the two partitions
>> don't actually share any sectors....
>
> yep, they don't share the same sector.
>
> # fdisk -l -u /dev/sda
>
> Disk /dev/sda: 146.0 GB, 145999527936 bytes
> 255 heads, 63 sectors/track, 17750 cylinders, total 285155328 sectors
> Units = sectors of 1 * 512 = 512 bytes
> Sector size (logical/physical): 512 bytes / 512 bytes
> I/O size (minimum/optimal): 512 bytes / 512 bytes
> Disk identifier: 0x0008911b
>
>    Device Boot      Start         End      Blocks   Id  System
> /dev/sda1   *        2048      487423      242688   83  Linux
> Partition 1 does not end on cylinder boundary.
> /dev/sda2          487424   285153279   142332928   8e  Linux LVM
>
>
> So just ignore this alert? Also, is it still possible to
> change the end cylinder of the /boot partition without breaking the grub?
>
> I think I am using grub2 per this
>
> # grub-install -v
> grub-install (GNU GRUB 1.98-1ubuntu10)
>
>>
>>                                                Nathan
>>
>> --
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>>
>
>
>
> --
> Asif Iqbal
> PGP Key: 0xE62693C5 KeyServer: pgp.mit.edu
> A: Because it messes up the order in which people normally read text.
> Q: Why is top-posting such a bad thing?
>
> --
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>


-- 
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Pandu E Poluan - IT Optimizer
My website: http://pandu.poluan.info/