Partitions on internal disk not always auto-mounting

I have a 24" 2·93GHz Imac running 10.5.8 with the internal hard disc split into five partitions: one for OS X, one for documents, one for first line backup of my email, one as a scratch area and one for Windows under Parallels. Occasionally, the documents and Windows partitions don't automatically mount at start-up. I can mount them in Disk Utility quite happily, and Disk Utility reports the hard drive SMART status as "Verified". Does anyone know why this is happening? Should I be (more) worried?

Was there a time when all five partitions mounted with each startup and then they quit doing so, or has this undesired behavior been present from when you initially created the five partitions?
I've never had a partitioned internal drive but I do use partitions on my external Firewire drive. Maybe someone else can comment but I wonder if the startup drive "likes" to have several partitions on it or not?
Regards,
Steve M.

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