| 摘要 |
A magnetic recording medium comprising a card-type disk drive and a magnetic disk cartridge. The disk drive has a length of 38 to 55 mm, a width of 35 to 51 mm, and a thickness of 3 to 5 mm, and comprises a drive mechanism for rotating the magnetic disk of the magnetic disk cartridge loaded in the disk drive, a magnetic head for magnetically recording or reproducing information on or from the magnetic disk, and an electric connection portion for electrically connecting the drive mechanism and the magnetic head with an electronic circuit provided in electronic equipment. The magnetic disk cartridge has a length of 25 to 36 mm, a width of 25 to 36 mm, and a thickness of 1 to 3 mm. The magnetic disk comprises a magnetic recording medium of high-recording density employing barium ferrite powder and has a recording capacity of 200 megabytes or larger.
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