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replace one disk in spanned dynamic gpt volume

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i have four dynamic gpt drives in a spanned volume. the disks are filling up and i would like to replace one of them with a larger drive. it seems simple enough to just take one of the drives and clone it to a new (larger) drive and then insert it back in the box and windows 7 wouldn't know the difference.

however, in practice when i take one drive out of the spanned volume i can find no way to clone it and all the data has to be rewritten from backup. this seems like a waste and it takes a lot of time to write 6 tb of data.

marketing for TI Home Plus Pak talks a lot about backing up and restoring dynamic drives but nothing specific for a dynamic drive from a spanned volume.

has anybody tried this? is it possible?

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Acronis states that it is not possible to clone dynamic disks

http://kb.acronis.com/content/6533

Limitations on dynamic disks and GPT disks support in Acronis True Image Home 2010 Plus Pack and Acronis True Image Home 2011 Plus Pack:
RAID-1 (Mirrored) and RAID-5 volumes are not supported. See also Acronis True Image Home: RAID Support;
Creation of Acronis Secure Zone is not supported;
Recovery of a dynamic volume as a dynamic volume with manual resizing is not supported;
GPT disks can be recovered only "volume-to-volume" without the possibility of resizing;
Try&Decide cannot be used for protecting dynamic and GPT disks;

Clone disk operation is not supported for dynamic and GPT disks.

Just to add to Pat's reply, if you clone a GPT disk it will not be bootable either.