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This is the error I received:

Failed to create the hard disk storage C:\Users\Sara\VirtualBox VMs\OSOS\OSOS.vhd.

Could not create the medium storage unit 'C:\Users\Sara\VirtualBox VMs\OSOS\OSOS.vhd'.

VHD: cannot set the file size for 'C:\Users\Sara\VirtualBox VMs\OSOS\OSOS.vhd' (VERR_DISK_FULL).

Result Code: VBOX_E_FILE_ERROR (0x80BB0004) Component: Medium Interface: IMedium {53f9cc0c-e0fd-40a5-a404-a7a5272082cd}

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I'm guessing you don't have enough disk space to make the virtual hard drive you were trying to make. – Rob Jul 26 '12 at 18:36
up vote 4 down vote accepted

The error code VERR_DISK_FULL sums it up. Your disk is full. Free up some space and it should work.

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Alternatively, decrease the size of your VHD. – Ryan Jul 26 '12 at 18:48
Decreasing the size of the virtual disk will work if it isn't a dynamically growable disk file. If it is dynamically growable, it's already as small as it can be. – Fran Jul 26 '12 at 18:59

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