Abstract: A storage subsystem includes a variable-size write buffer that temporarily stores write data received from a host system. The storage subsystem is capable of adjusting the size of the write buffer so as to vary both the performance (e.g., sustained write speed) of the storage subsystem and a risk of data loss. In one embodiment, the storage subsystem implements a command set that enables the host system to directly control the size of the write buffer. The storage subsystem may additionally or alternatively be capable of adjusting the size of the write buffer based on monitored operating conditions, such as the temperature, the stability/consistency of a power signal received from the host system, and/or the elapsed time since the storage subsystem was last powered up.

Abstract: A storage subsystem contains multiple non-volatile memory arrays that are accessible to a host system when the storage subsystem is connected thereto. The storage subsystem implements commands and/or modes for enabling the host system to create and use backup copies of files, such that the host system can recover when files become corrupted or otherwise lost. In one embodiment, the storage subsystem presents the non-volatile memory arrays to the host's operating system as distinct storage devices (e.g., ATA device 0 and 1), and implements special commands for copying data between these storage devices. The subsystem may alternatively present the memory arrays to the host operating system as a single storage device. The storage subsystem may have a standard form factor, such as a form factor commonly used for memory cards.

Abstract: A PCMCIA compatible memory card having a serial communication interface is provided. The serial communication interface includes a controller, a serial transceiver, and a serial communication port. Coupled between the controller and the serial communication port, the transceiver enables the controller to send or receive data through the serial communication port. Nonvolatile memory on the card is accessible by the controller. A cable connects the serial communication port of the memory card to a serial communication port of an external host computer. The controller operates in accordance with commands received from the host computer through the serial communication port of the card for sending data read from memory of the card to the computer, writing data to memory of the card received from the computer, loading a file into memory of the card received from the computer, erasing data from memory of the card, or verifying data in memory on the card.