| 摘要 |
<p>A data transfer apparatus is disclosed as typified by a floppy disk drive which, together with one or more like devices, is daisy chained to host equipment comprising a central processor unit and an associated controller. Each disk drive comprises a disk motor (20) for rotating a record disk (18) unter the control of a disk motor drive circuit (46), a head motor (26) for incrementally moving a transducer head (22) radially of the record disk under the control of a head motor drive circuit (52), and a read/write circuit (64) for processing data read from, or to be written on, the record disk via the transducer head (22). The host equipment produces, among other control signals, a MOTOR ON signal for the on/off control of the disk motor via the disk motor drive circuit (46). In order to avoid waste of electric power, not only the disk motor drive circuit (46) but also at least either, preverably both, of the head motor drive circuit (52) and the read/wirte circuit (64) is connected to a common power line via a power control switch (100) which is closed only when the MOTOR ON signal is in a prescribed state to cause rotation of the disk motor. </p> |
