本文介绍了一种通过整理磁盘碎片并转换虚拟磁盘文件来减少虚拟机占用硬盘空间的方法。适用于运行内存较大的虚拟机，例如Windows XP。操作包括运行命令提示符作为管理员，使用vmware-vdiskmanager进行磁盘碎片整理，修复磁盘文件，缩小磁盘大小并再次修复，最后将原始文件转换为更小的新文件。
In my laptop, I have two virtual machines, and their VM disks take about 80GB-100GB hard disk. But if you mount the VM disks, you will find that half of the space is pre-occupied, but not used. Luckily, VMware provides some ways of shrinking the VM disks. I’ll take my Windows XP VM as an example to tell how to reduce the hard disk space of VM.
1. Find the Virtual Machines folder. Normally, it locates ‘C:\Users\<your NT ID>\Documents\Virtual Machines\<specified VM>’ and in this case, it’s ‘C:\Users\wuj28\Documents\Virtual Machines\WinXP’. You can find there is one file, whose extension is vmdk, and size is about 25GB. This is the target we’re going to shoot today. If you have a good memory, the value of 25BG is set by the VM creator, and its value can be viewed in the VM settings.
a. Run the CMD as the administrator, and go to the VM folder.
b. Run the vmware-vdiskmanager to defrag the VM disk.
c. Repair the VM disk file after the defragment.
d. Shrink the VM disk and repair again.
Now we have a very solid VM disk file.
3. Create the new VM disk file by converting the original one.
You can find the new VM disk file is a lot less than the original one. Now you can move the original VM disk file to another folder, and rename the new VM disk file as the original one. Then power on your VM. If there is no problem, you can shift-delete the old & fat VM disk file now, and the disk space comes back
TIP: These operations need you have enough disk space, so if you have snapshots for VMs, you can deleted them all. It will free some GBs space, depends on how many snapshots you have.
1. Find the Virtual Machines folder. Normally, it locates ‘C:\Users\<your NT ID>\Documents\Virtual Machines\<specified VM>’ and in this case, it’s ‘C:\Users\wuj28\Documents\Virtual Machines\WinXP’. You can find there is one file, whose extension is vmdk, and size is about 25GB. This is the target we’re going to shoot today. If you have a good memory, the value of 25BG is set by the VM creator, and its value can be viewed in the VM settings.
a. Run the CMD as the administrator, and go to the VM folder.
b. Run the vmware-vdiskmanager to defrag the VM disk.
c. Repair the VM disk file after the defragment.
d. Shrink the VM disk and repair again.
Now we have a very solid VM disk file.
3. Create the new VM disk file by converting the original one.
You can find the new VM disk file is a lot less than the original one. Now you can move the original VM disk file to another folder, and rename the new VM disk file as the original one. Then power on your VM. If there is no problem, you can shift-delete the old & fat VM disk file now, and the disk space comes back
TIP: These operations need you have enough disk space, so if you have snapshots for VMs, you can deleted them all. It will free some GBs space, depends on how many snapshots you have.
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