Hi DooMRunneR
It is possible with VMWare VI Toolkit
Download VMWare VI Toolkit for Windows from http://www.vmware.com/download/sdk/
Install it on a Windows XP or any Windows OS.
Open VMware VI Toolkit (for Windows) and run the following commands
get-viserver <name/IP of ESX Host> - this command connect VI toolkit to ur host, enter root user ID and password when it prompts.
get-vm | get-harddisk - this command will answer your question
If u need t output to a file u can use
get-vm | get-harddisk > c:\details.txt
Regards
Shamim