[cctalk] Re: Odd IBM mass storage systems (was: Re: Re: IBM 360)

While on the topic of odd IBM mass storage systems, does anyone recall an IBM system that used rotating carousels holding sheets of magnetic material? The carousel would rotate to position the selected sheet into the read/write station, where it would be moved up and down relative to the multiple fixed heads, a weird linear riff on a fixed head disk. LBL had one of these systems, installed in the same room as one of the few examples of the IBM 1360 photo digital storage system. They kept a broom next to the later in order to sweep up the photo chips when the thing occasionally spewed them everywhere.