How to create bootable ISO from segmented Windows 7 image on El Capitan I have a canned Windows 7 Enterprise image that is spread across 7 discs. However my Dell M90 has a bad optical drive and scratches discs. So I used my MBP and Toast Titanium 11.0.2 to create ISOs of all the DVDs.

I tried to boot from USB on the Dell M90, but I cannot get it to "see" the first ISO (plus I have many other ISOs on that external drive). I have a 8GB PNY thumb drive but cannot get the first ISO onto the drive so I can boot from it - that option is no longer in Disk Utility (grrr) and Toast doesn't seem to offer that ability (it only offers optical discs as a destination).

Does anyone know of a way to get an ISO onto a bootable USB flash drive? I also cannot connect to a network until the image (all 7 discs) are installed and the image boots up.
Windows 7 (any version) fits on one disk of any optical media, not sure what is going on with what you have or exactly what it is, that said...

You can't boot from an ISO, you need to burn it to CD/DVD or install it to an external drive of some sort in a way that makes it bootable.

Depending on what is going on here you may be able to use Disk Utility.app to create either optical media or a USB drive that is bootable.

Open Disk Utility and select "Scan image for restore" and select the ISO. Attach your USB drive and restore the ISO to that USB drive, which should (I believe, it's been a while since I tried this...) give you a bootable Windows install disk.

Also depending on which Mac you have and the OS version BootCamp assistant may be able to create a bootable Windows 7 installer.