Even writable Blu-ray disks top out at 25 or 50 GB nowadays (single vs. First and foremost, with capacities of 256 GB or beyond, UFDs can accommodate a great deal more stuff than optical media can. These days, a bootable repair environment is most likely to be housed on a USB flash drive (aka UFD), for a variety of good reasons. Historically, using a bootable repair environment meant using some form of optical media custom-crafted to provide a working runtime that could access the system to check its hardware, inspect the boot sectors and disk layouts, tinker with OS files, etc. It provides an alternate runtime environment to take over for the non-functional Windows OS. The general concept of a bootable repair environment is pretty straightforward. Despite all the many potential causes and symptoms, the situation remains the same: For whatever reason, a Windows system won’t start up and run as it should. The causes of this lamentable system state are as varied as the symptoms, which can range from an inability to boot Windows to a non-functional keyboard or display (hard to do anything in Windows without input or output). If you work with Windows systems, especially on the client side, you’ll occasionally need to bring an inoperable system back to life.
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