Why is there no bootable disk found when using windows install disk?
i hade this problem a few times it's because os x somehow can't set the axtive flag which is needed by the bios/efi tho know at which disk thy should overgive the bootloader.

so you need to set the partition as active by hand via Terminal


Go to finder/Spotlight, and launch Disk Utility
Select the usb disk, and create a partition. Format it as MS-DOS FAT and select Options > MBR
Go to the Terminal, and type the following


diskutil list

locate the name of your usb device. In my case it was rdisk2. Depending on your OS version it could differ.

diskutil unmountDisk /dev/rdisk2

Make the partition active and unmount the disk

sudo fdisk -e /dev/rdisk2
print
f 1
write
print
exit
diskutil unmountDisk /dev/rdisk2

have a look here for a colorful howto: http://tech.anoj.net/2013/01/fixing-unetbootin-on-mac-os-x-to-create.html?m=1