If you do not have MDOP/Software Assurance, consider these free alternatives with similar functions:

The term "MSDaRT ISO" refers to the file format used to distribute and deploy this toolkit. An ISO file is an exact archive of a disk image. In this context, it contains a bootable, lightweight version of Windows preloaded with the DaRT tools.

As long as Windows computers break, there will be a need for a bootable environment that allows technicians to look under the hood—and the MSDaRT ISO remains the gold standard for that job.