Tandy 1000 HX Technical Reference Manual page 385

5. Power On Initialization
In order to reduce the peak current requirement when used in a daisy
chain, the MP-F63W-7 2D has been disigned not to seek track 00
automatically. If all the drives connected in the daisy chain
sought track 00 simultaneously, this would place a significant power
drain on the host system. Thus, the host system must perform the
following routine just after power on in order to reset the track
counter inside the drive.
Power On Initialization
Page 21