How to tell which physical disks have bootable MBR?

Posted by Jon on Super User See other posts from Super User or by Jon
Published on 2012-11-25T22:18:27Z Indexed on 2012/11/25 23:10 UTC
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windows-7

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boot

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mbr

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bootable-media

The computer I am using right now has 6 physical disks attached. Using the BIOS's "select boot device" functionality I have discovered that I can boot off 3 of these disks into the exact same bootloader. This means that all of these disks have the bootable flag set on their MBR, even though I had been under the impression that only 2 of them are in fact bootable.

My question is: is there an easy way to check which disks have a bootable MBR with a command line tool or some OS utility? I am aware of the DISKPART tool and its basic functionality, but I haven't found how to view the information I need.

The OS is Windows 7 x64 Ultimate with SP1.

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