Abstract: The present invention provides a storage unit for accessing a storage medium according to a direction from a computer, a condition monitoring program product executed in the computer to which the storage unit is connected, and a storage medium thereof, having a configuration advantageously providing information for a user to properly address an abnormal condition in the storage unit. The storage unit includes a date storage module for storing a current date reported from the computer only a first time the storage unit is connected to the computer and maintains subsequently the date. The condition monitoring program receives the date stored in the date storage module from the storage unit connected to the computer and presents a message according to the number of days elapsing between the date and the current date.

Abstract: A media storage apparatus switches the number of segments of a cache memory according to a data transfer amount from an external device at high speed according to a successive data transfer amount from the external device. A media storage apparatus receives both succession information of write data, and a data transfer amount per command, from an external device. On recognizing that the write data are successive, the media storage apparatus modifies the number of segments of a cache memory according to the data transfer amount. With this, the number of segments can be modified immediately to the number suitable for write processing of the write data of the transfer amount, and high-speed write processing can be achieved.

Abstract: A medium storage device switches the number of segments of a cache memory according to the transfer volume from a host, and this medium storage device switches the number of segments at high-speed. The medium storage device changes the number of segments of the cache memory according to the maximum transfer volume of one command depending on the type of the OS, based on the notification from the host device on the type of the OS. By this, the medium storage device executes write processing at high-speed using the number of segments appropriate for the write processing of the OS.

Abstract: The present invention provides a storage unit for accessing a storage medium according to a direction from a computer, a condition monitoring program product executed in the computer to which the storage unit is connected, and a storage medium thereof, having a configuration advantageously providing information for a user to properly address an abnormal condition in the storage unit. The storage unit includes a date storage module for storing a current date reported from the computer only a first time the storage unit is connected to the computer and maintains subsequently the date. The condition monitoring program receives the date stored in the date storage module from the storage unit connected to the computer and presents a message according to the number of days elapsing between the date and the current date.