Floppy Disk Types and Specifications

Tableaux de référencement des types de disquettes et leurs spécifications

Télécharger ce document : Floppy disk types and specifications (94.3 Ko)

Category	Specification	360 KB 5.25"	1.2 MB 5.25"	720 KB 3.5"	1.44 MB 3.5"	2.88 MB 3.5"
Drive	Read/Write Heads (Data Surfaces)	2	2	2	2	2
Drive	Spindle Motor Speed	300 RPM	360 RPM	300 RPM	300 RPM	300 RPM
Controller	Minimum Controller Transfer Rate	250 Kbits/s	500 Kbits/s	250 Kbits/s	500 Kbits/s	1 Mbits/s
Media	Track Density (TPI)	48	96	135	135	135
	Bit Density (BPI)	5,876	9,869	8,717	17,434	34,868
	Density Name	Double Density (DD)	High Density (HD)	Double Density (DD)	High Density (HD)	Extra-High Density (ED)
Geometry	Tracks (Cylinders)	40	80	80	80	80
	Sectors Per Track/Cylinder	9	15	9	18	36
	Total Sectors Per Disk	720	2,400	1,440	2,880	5,760
File System	Cluster Size	2 sectors	1 sector	2 sectors	1 sector	2 sectors
File System	Maximum Root Directory Entries	112	224	112	224	448
Capacity	Unformatted Capacity	~480 KB	~ 1.6 MB	~1 MB	~2 MB	~4 MB
	Formatted Capacity (binary kilobytes)	360	1,200	720	1,440	2,880
	Formatted Capacity (bytes)	368,640	1,228,800	737,280	1,474,560	2,949,120
	File System Overhead (bytes)	6,144	14,848	7,168	16,896	17,408
	Total Usable Capacity (bytes)	362,496	1,213,952	730,112	1,457,664	2,931,712
	Total Usable Capacity (binary KB)	354	1,185.5	713	1,423.5	2,863
	Total Usable Capacity (binary MB)	0.346	1.158	0.696	1.390	2.796