I have been using winiso to check some disks for bootability but now I don't trust it. It reported BartPE as non bootable but it booted on a broken machine for me.
The machine is an old Acer Aspire. All hard drives disconnected. So the disk had booted, seems to me. Same with a RAM diagnostic disk. Running at this moment. WinISO said that was nonboot, too.
I would like some other way to test disks. Anyone know of one?