... Hard disk drive, capable of parallel data-ransfer via 1, 4, 5 or 6 channels at, respectively, a rate per second of 3,014 megabytes, 12,05 megabytes, 15,07 megabytes or 1,08 megabytes, comprising 8 magnetic disks of the 8 inch type with a total storage capacity, unformated, not exceeding 1 000,2 megabytes and incorporating a storage-module-drive interface, for use in the manufacture of cardiodiagnostic apparatus (a) ...