If your Virtual Disk is a single file, then your free space requirement can grow up-to the full size of that virtual disk. So how much extra space you need depends on how you configured the virtual disk for your Virtual Machine. The shrinking process consists of making a copy of your virtual disk while omitting the zero'd out blocks. How much free space do you need before shrinking?Īlso please note that you need more free space in order to be able to run the shrinking process. You can still reclaim space, but it will be less optimal.Īlternatively you can use the "Partially zero out" trick described below. If you don't have that kind of free disk space then you can skip the zero-ing out part. This means that while you can use the technique to reclaim disk space after the unused space is zero'd out, it is important to have enough space before you start. For each byte that is changed to zero the virtual disk will need to claim a byte. Note that the technique described below to zero out the unused space on the guest OS will in fact make your guest virtual disk grow to the maximum size first. 3 Zero out unused space on a Windows VM.2.1 Zero out a part of your virtual disk.1.2 Using the clean up option in the menu.1.1 How much free space do you need before shrinking?.
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