I have never been able to get the bootloader to run from an extended partition, but I've only ever tested it under Qemu. I flag the extended partition, then flag the A6 partition in the extended MBR. I get:
Quote:
Using drive 0, partition 3
Using drive 0, partition 0
No O/S
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What I did learn, though, was that the extended MBR needs both a proper signature and MBR boot code (installed with the fdisk "update" command), and, that the first track (e.g. 63 sectors) should be reserved to prevent overlay, just as with the primary MBR.