The B2 does not run 'Scan Disk' on the internal HDD during startup. What it does do at this time is that it reads the 'b2db' database management file from the HDD into main memory so that it can very fast artist, album and track lookup functions.
I sometimes use this process to load up another user's 'b2db' file into one of my B2s so that I can diagnose a problem. With a foreign 'b2db' file loaded up, my B2 will then behave exactly like the user's B2, except of course that it cannot play the actual music tracks. But it will perform almost all other functions.
Regards,
Peter.