The length of tape between BOT and EOT is referred to by what term?

The term that refers to the length of tape between the Beginning of Tape (BOT) and the End of Tape (EOT) is "Usable recording surface." This term is used to describe the area on the tape that is available for recording data. In magnetic tape storage systems, this portion is crucial because it is the actual segment of the tape that can be utilized for storing information.

In contrast, terms like "Magnetic length," "Active storage area," and "Tape capacity" can refer to different aspects of tape properties or performance but do not specifically define the usable area between the BOT and EOT. The "Magnetic length" could relate to the overall magnetic length of the medium, while "Active storage area" might suggest a region with data actively accessible, and "Tape capacity" refers more generally to the total amount of information the tape can hold, not specifically the section between BOT and EOT. Therefore, "Usable recording surface" is the most accurate term for this context.