Abstract: A disk cache device for secure writing comprising a backup power supply source (62) for supplying backup power for a given duration to a computer system fed by two main electric power supply devices (60, 61) and comprising at least one hard disk drive (1a, 1b, 1c), and a host system (3). All of the disk drives (1a, 1b, 1c) are linked by a bus (2) to a connection (30) of the host system (3) (host bus adapter), and a monitor (50) for monitoring at least the backup electric power supply source (62) and the main power supply devices (60, 61). Monitors (50) are connected to the interface (2) and can be interrogated by an interrogator (31) for interrogating the host system (3) so that the latter can enable the write disk cache function, or not, in the write commands to be sent to the disk drives (1a, 1b, 1c) in accordance with the information gathered by the monitoring means (50).

Abstract: The present invention relates to a disk storage subsystem with multiple configurable interfaces, characterized in that it comprises at least one interface adapter board (1a, 1b), at least one drawer (4), each comprising a plurality of disks (20), each drawer (4) being connected to an adapter board (1a or 1b) by SCSI disk interfaces (2), a first adapter board (1a or 1b) comprising a switch (11) for modifying the addressing system of the disks (20) of at least one drawer (4), the adapter board or boards (1a, 1b) each comprising two independent single-ended/differential-ended SE/DE converters (7), each SE/DE converter (7) being connected to a drawer (4) and fed by either of two direct current/direct current DC/DC converters (7) of the adapter board (1), and two external SCSI connectors (10) being connected to each SE/DE converter (7).