Hi, I'm trying to build a boot CD following "Bart's way to create bootable CD-Roms (www.nu2.nu)" using isolinux and memdisk. The image I'm trying to boot is built containing IBM's PC-Dos. This works perfectly on 2 of my machines, but the 3rd fails. I get all the 'normal' memdisk messages, finishing with: Loading bootsector... booting... Non-System disk or disk error Replace and press any key when ready. The last 2 lines are embedded in the bootsector, so I know it's loaded that correctly. If I build an image using Win 98 Dos instead, then this works OK. Also, if I build a CD that uses *exactly* the same PC-Dos image as it's boot 'sector', it also boots OK. So, the failure is only with PC-Dos and only when loading via memdisk. Any ideas why I am getting this failure on just one machine, with just PC-Dos. Cheers, Eddie