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Re:What are the Windows A: and B: drives used for? by martin-adams on Saturday October 19, 2013 @10:51AM (#6576576)
That's why you had a backup set of those disks.
Re:What are the Windows A: and B: drives used for? by DanBC on Saturday October 19, 2013 @04:03PM (#6577595)
Many of the MS disks used weird methods and formats, making copying the discs not easy.

https://en.wikipedia.org/wiki/Distribution_Media_Format