Apple TIL file explains volume icon ordering

When Mac OS 8.5 first came out, several users reported that the Finder would "mysteriously" rearrange the vertical order of the drive/volume icons. A new Apple TIL file, Mac OS 8.5: Disk Positioning on Desktop after Startup (#30871), offers the explanation:

In Mac OS 8.5, the Finder orders partitions on the desktop in the following manner: 1. Boot partition 2. Non removable partitions 3. Removable partitions (like Zip, CD-ROM, etc.) 4. Mounted servers. Within groups 2, 3 and 4, the items are ordered by the amount of space used on the partition (as opposed to the size of the partition). Therefore, as one partition fills up, its place in the ordering can change.