I have recently launched ZIPmagic 12.2, which includes DoubleSpace - a one-click tool with the following benefits for WIMBoot (that you don't get with any other tool or utility at this time):
1. Four Levels of Compression: Three compression grades stronger than WIMBoot
2. On-the-Fly Compression: Convert a full disk without requiring additional storage
3. Compress Apps and Data in Addition to OS: Save space on all files stored on your disk - not just Windows
4. Recompression: Reclaim additional space as apps/files are added/deleted
5. Does Not Require Windows ADK: No need to download and install gigabytes of data
6. Does Not Require Windows PE 5.1: No need to create bootable Windows on external USB
7. One-Click Operation: No need to type endless commands in a console
8. Use All CPU Cores for Compression: Maximize compression speed and space gain
9. 32 bit Windows Support: Compress any x86 system
10. BIOS Support: Not limited to UEFI systems
11. Mechanical Disk Support: Compress any HDD, not just SSDs
That's 11 reasons to use DoubleSpace, or 11 things you wished you could do with WIMBoot, but can't.
I personally use it on my 64 GB Surface Pro, where I developed the tool. Indeed, every invention is born out of a real need
I also tested it on a 7,200 rpm notebook drive. There was, similar to the SSD, only very nominal performance impact.
Your guess is as good as mine as to why Microsoft advertises WIMBoot as being HDD/x86 incompatible.
It totally is.