A "public beta" mount/unmount surprise for you.

[Michael@wengam]

Nope. It remains mounted. Disk Utility and drag-to-trash are the only things that successfully unmount it.

I am curious why 'Eject OSX_silver_B", for example, is greyed out in the Finder's menu command. It is the same story for all my SATA partitions and two ATA drives working as a single RAID volume.

And, by the way, System Profiler 4.1.1 seems to know nothing of my two SATA drives. This is even though I am booted off one of them, and they get the full information breakdown in Disk Utility, where I partitioned them. In System Profiler, however, the two ATA drives running together as a RAID do appear under Hardware-->ATA; the SATA Seritek PCI card has a basic listing under Hardware-->PCI Cards; but under Hardware-->Serial-ATA I just see the phrase "No information found."