| 摘要 |
<p>PROBLEM TO BE SOLVED: To make the best use of USB high speed communication and also to avoid consuming unnecessary standby power by adopting a write back method. SOLUTION: A power supply controlling part 54 establishes power supply Vcc by receiving +5 V (USB) supply and operates an MO driving part 28 and a bus converting part 38 between a USB and an ATA in order to utilize a plug-and-play function and a hot plug function which are the excellent point of a USB standard. The once established power supply Vcc is subjected to self-maintaining during operation in which information recorded only in the cache memory of the part 28 is entirely recorded on an MO disk in a nonvolatile manner. As soon as the cache memory receives the last information transmitted from a host, it is returned to the host side that the information is accurately received, and also even when the host side disconnects the +5 V (USB) of the USB, the information in the cache memory is reliably written on the MO disk and the power supply Vcc is subsequently disconnected to avoid the consumption of unnecessary standby power.</p> |
