High-density flexible disk drive having a function of facilitating correct insertion of a large-capacity flexible disk thereinto without an insertion error

A large-capacity flexible disk adapted to be inserted into a high-density flexible disk drive, said disk comprising a case containing a magnetic disk medium, said case having a pair of projecting portions formed at a rear portion of said case in an insertion direction of inserting said large-capacity flexible disk into said high-density disk drive, said pair of projecting portions laterally outwardly extending from both lateral sides of said case, said case having a first width which includes said projecting portions at said rear portion measuring at least 91 mm, said case having a second width at a remaining portion at which said projecting portions are not formed being equal to 90 mm, said projecting portions preventing insertion of said large-capacity flexible disk into a normal-density dedicated flexible disk drive and enabling insertion of said large-capacity flexible disk into said high-density flexible disk drive.

A large-capacity flexible disk adapted for insertion into a high-density flexible disk drive, said disk comprising a case containing a magnetic disk medium, said case having a pair of projecting portions formed at a rear portion of said case in an insertion direction of inserting said large-capacity flexible disk into said high-density flexible disk drive, said pair of projecting portions laterally outwardly extending from both lateral sides of said case, said case having a first width which includes said projecting portions at said rear portion measuring at least 91 mm, and a second width at a remaining portion at which said projecting portions are not formed being equal to 90 mm, and wherein said projecting portions prevent insertion of the large capacity flexible disk into a normal density dedicated flexible disk drive while allowing insertion of the large capacity flexible disk into said high density flexible disk drive.

A large-capacity flexible disk adapted for insertion into a high-density flexible disk drive, said disk comprising a case containing a magnetic disk medium, said case having first and second surfaces and a pair of projecting portions formed at a rear portion of said case in an insertion direction of inserting said large-capacity flexible disk into said high-density flexible disk drive, said pair of projecting portions laterally outwardly extending from both lateral sides of said case, said case having a first width which includes said projecting portions at said rear portion measuring at least 91 mm,

• wherein the projecting portions include first and second surfaces,
• wherein the first and second surfaces of the large-capacity flexible disk are contiguous with the first and second surfaces of the projecting portions, and
• wherein said projecting portions prevent insertion of the large capacity flexible disk into a normal density dedicated flexible disk drive while allowing insertion of the large capacity flexible disk into said high density flexible disk drive.