In the 4th photo, she's not actually loading magnetic tape, she's loading a disk pack. She's opening the access door on the "inventory" disk drive and has another disk pack sitting on top of the "names" disk drive. A disk pack is basically a removable hard drive without the control electronics and mechanical parts. The control and mechanism is housed in the dishwasher sized cabinet and the disk pack contains just the disk platters themselves in a plastic cartridge. The disk platters are not completely sealed from the environment, but the plastic cartridge protects them from dirt and dust. Around this time period these cartridges probably stored something like 1-2MB of data.
Wikipedia article on disk packs: http://en.wikipedia.org/wiki/Disk_pack
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