message "connect removable drive"

[freem@n]

maybe you mean the backup feature of XBian which works in the background by default, creating a snapshot every once in awhile (don't know how often by default). when the snapshot was created there is always a notfication toast message that looks like somebody disconnected a physical drive. maybe you can look at the name of the drive the next time you see this "strange" message. if it's something with xbian there is a good chance that this is actually the cron job (or sth.) for creating a snapshot.

don't take my word too serious, just wanted to help you a bit, hopefully I'm not completely wrong. Maybe you can tell us more about this popup message (I'm sure it doesn't actually asks you to do sth. immediately, because there is no way you could interact with this simple notification window) and eventually some guy of the XBian staff can give you a more professional answer ;-)

Cheers, freem@n