Which of these noises sounds the most like my unhappy drive?
(Warning: all of them are a bit loud.)
The drive I recorded (and replaced — shiny new 500GB SATA for naib) is a 200GB IDE Western Digital, about four years old, and having seen constant duty (on, if not reading/writing). There was no apparent data loss, and the drive replacement was mostly for space, though the sound was worrying.
Also, naib's updated to OpenBSD 4.2.