Extend disk

Doodad Boy
Doodad Boy used Ask the Experts™
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I had C drive Dynamic type disk, Partition sty;e "Master Boot Record" and would like to extend the disk, but i having below prompt upon extending the disk.

The selected volume is a system or boot disk or was created on a basic disk in an earlier version of Windows and cannot be extended
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AlexSenior Infrastructure Analyst

Commented:
Did you upgrade from Windows previously, could you provide the OS version and what you upgraded from?
Top Expert 2016

Commented:
if the disk is mbr then you can't make a partition larger than 2TB
Top Expert 2016

Commented:
from your tags it seems as if you upgraded from Windows Server 2003.

if so and if the C disk is old, you may consider to backup the disk and restore it to a newer disk which already has a partition of the new size required.

can you show a screenshot of your Disk Management Volume List view?

Sara
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Top Expert 2014

Commented:
Sounds like you are trying to use dynamic disk extension, that is not valid for the boot disk. You need to use an offline tool such as Bootit BM or EaseUS disk manager (or one of the dozen or two alternatives). 2TB limit David Johnson mentions still applies.
Top Expert 2016
Commented:
you cannot extend the system volume while the operating system is booted.

you may however try to expand the system volume if you booted from an NTFS boot disk. this allows you to using the commandline where you can invoke diskpart to resize the disk with the c partition granted that there is contiguous free space available. note, with diskpart you also could remove partitions which may block the extension of C partition (of course you should have made a backup of all the partitions of the disk).

DISKPART > Select Disk 0 
(Disk 0 is the selected disk)

DISKPART > Detail Disk
(shows details ....)

DISKPART > Select Volume 1
(Volume 1 is the selected volume.)
(shows size of volume 1)

DISKPART > Extend 
(if no size is specified all available space will be allocated) 
(Disk Part successfully extended the volume)

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of course you must use the right disk and volume numbers (in the sample i used disk 0 and volume 1). the detail command will provide you with the needed information. additionally you may never forget to select the disk or volume before changing anything.

Sara
Top Expert 2014

Commented:
Yup, that will work Sara although they may have partially shagged it by converting to dynamic disks.
Top Expert 2016

Commented:
if you booted from an NTFS boot disk

alternatively you may add the disk to another computer. but make sure in the bios that the added disk was not used as boot disk.

check disk management view for the disk number the added disk has. it should be a new number (e. g. number 3 if the system has now 3 disks).

Sara

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