Using "diskpart" to expand a dynamic volume

Posted on 2004-11-01
Last Modified: 2008-01-09
I've seen several kb articles that say it's not possible to expand a SYSTEM volume that was once Basic and then upgraded to Dynamic.

Is the same true for Data Volumes?  If so is there anyway to expand the data volume on a "upgraded disk"?

When using extend in DiskPar - is it instantaneous?
Question by:HDGuru
    LVL 15

    Expert Comment

    Using 'DiskPart'    
    For basic volumes, the unallocated space must be on the same disk as, and must follow (be of higher sector offset than) the partition with focus. A dynamic simple or spanned volume can be extended to any empty space on any dynamic disk Using this command, you can extend an existing volume into newly created space.
    If the partition was previously formatted with the NTFS file system, the file system is automatically extended to occupy the larger partition. No data loss occurs. If the partition was previously formatted with any file system format other than NTFS, the command fails with no change to the partition. You cannot extend the current system or boot partitions.

    1. Enter the 'diskpart' utility (Start => Run... => type 'cmd' and press 'Enter' => type 'diskpart' amd press 'Enter').
    2. Type 'list disk' and press 'Enter'.
    3. Type 'select disk <Disk Number>' and press 'Enter'.
    4. Type 'extend <number of MB>' and press 'Enter'.

    Hope that answers your question.


    Author Comment

    It didn't, but thanks anyway.  My question is if it's possible to expand a "upgraded" disk.  I know it's possible to expand a basic disk and a dynamic disk that was formatted dynamic to begin with.  But I want to know if anyone has expanded a "upgraded" disk (one that was basic to begin with and then upgraded to dynamic after the fact).

    I've ran the diskpart utility anyway to see if it'll work - and after my last command to extend the disk, nothing happens.  I let it sit for as long as 2 hours - and nothing happened.
    LVL 15

    Accepted Solution

    Oh, the answer for this is You can extend only volumes created on a dynamic disk, not volumes created on a basic disk that you've upgraded. If you try to extend volumes created on a basic disk, you'll receive the error "DiskPart failed to extend the volume. Please make sure the volume is valid for extending."

    Hope that answers your query


    Author Comment

    That answers my question - can you give me the source of your answer?  KB Article..etc...?
    LVL 15

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