The various prompts/options read as follows: I've downloaded Rufus Portable and installed it. If you want to boot a CD you can burn the iso on any Windows 7 computer by right clicking and selecting Burn Disk Image. SecureBoot also needs to be disabled if you have that setting. If the computer is UEFI you will need to select CSM or Legacy Boot in order for Seagate to boot. Backup anything on the flash drive as it will be formatted. If you see FreeDos in the dropdown box select iso image, click the icon and browse to the iso file. I've done a bit of digging and know that various specific bootable flash drives can be created, such purposes as Windows 10 installation media or Memtest86 but I don't know if there's a generic way to make a flash drive bootable for *any* program I happen to need to run.

The computer won't boot so I don't have any way to get to a DOS prompt (unless the Command Prompts in the Repair Windows options will work for this purpose.)

Am I correct in believing that an ISO file always implies that it needs to be burned to a DVD? Or can I put it on a flash drive and use it there 'as is'? If I do that, will it be a *bootable* flash drive because that's what I need (I think). I found and downloaded the DOS version of Seagate Seatools but it is an ISO file. (He's getting a NTFS_FILE_SYSTEM stopcode in Windows 10 when he tries to boot up.) As per the pinned suggestion in this subforum, I want to run Seagate Seatools for DOS, ideally from a bootable flash drive, to make sure his hard drive isn't hosed. I am trying to help my brother, who is NOT computer savvy, with a problem he is having.

Seatools for dos usb