Artifact Details Title Disk recording density memento Catalog Number 102741261 Type Physical object Description The object consists of a disk and a paper envelope. The disk is printed to show the the relative amount disk real estate consumed by IBM storage producats during the period 1956 - 1991. Date Circa 1991 Manufacturer IBM Corporation Dimensions overall: 1/8 in x 3 3/4 in x 3 3/4 in Category Ephemera/other Credit Gift of James N. Porter Lot Number X6504.2012