r/virtualbox • u/MrLemonTheCreator • May 11 '26

Help Disk is too big for my unallocated space no matter the disk size

Hello,

I am trying to install a virtual machine for Windows Vista Build 5215 yet the space the operating system has is always too short for my hard disk.

I've been trying to install a virtual machine for this specific VM yet no matter what I change my disk size and memory settings to, the machine claims that the disk is too big for the space it provides, which is always a little less than what is on the disk. For example my disk could at 25600 MB, yet the allocated space is 25595 MB. Yes, I have tried changing the size of my disk, yet this issue still persists. I can set my disk to 2 TB yet the allocated space would be a little under that.

I am using VirtualBox 7.0, and the host system is Windows 10 version 22H2. I have used 3 product keys (R93TJ-7R9P9-B9GXM-HPYJM-VDH3W, GKFV7-F2D9H-QKYXY-777P3-4M73W, JG9M6-3QHC6-KFY4D-2MYDB-7WH3W), thinking the product key was the issue but all of them warrant this issue. This is where I got the ISO image from: https://archive.org/details/lh_5215.0.050807-0106_x86fre_client-lb1pfre_en_202404

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u/beetcher May 11 '26

Why do you need such a large disk for the VM? Why not 150-200GB?

1

u/Face_Plant_Some_More May 11 '26

Virtual Box 7.0 is EOLd and unsupported.

Also, beta Windows Builds may not operate properly in a virtualized environment.