cmtig004.png shows a four-column, six-row array of storage disk devices. These disks are numbered from 0 to 23, numbered in sequence from the bottom left corner (column 1, row 6) to the top right corner (column 4, row 1), progressing from left to right, and from the bottom row, row 6, to the top row, row 1.

Disks 0 through 19 are hard disk drives. Disks 20 through 23 are solid state disk drives.