What has a radiation-hardened R6000 CPU from Lockheed-Martin Federal Systems, 120 Mbytes of RAM and 256 Mbytes of flash; is mounted in a 6U VME chassis, & runs Wind River Systems’ Vx-Works version 5.3.1? The Spirit Rover, of course. This article at EETimes goes into much more detail about what exactly happened when Spirit went down over the weekend a few weeks ago, & what led up to its problems.
“We recognized early in the planning process that the flash file system had a limited capacity for files. It is not just a limitation in the flash itself but also in the directory structure.”