BeebSCSI with UltraForm
The purpose of this was to investigate an early problem I had found, which was that seeking to locations towards the end of the disc seemed to be considerably slower than early seeks.
Nothing is given away in the centisecond count shown, because access to peripherals like hard drives on the 1MHz bus cause the Beeb's internal timers to halt during the access. So instead I have to read-out the time from the real-time clock, and we can see that this shows the access time increasing from about 2 seconds, to between 3 and 4 seconds as the end of the disc is reached.