5.25" Floppy Disks - Digital Media Transfer Kits - LibGuides at MIT Libraries
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How Old School Floppy Drives Worked - YouTube
Disk II - Wikipedia
Floppy disk - Wikiwand
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Amiga 1000 personal computer external 5 1/4-inch floppy disk drive | X1611.99F | Computer History Museum
Dual 5 1/4" external floppy disk drive | 102741053 | Computer History Museum
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5"1/4 Floppy Disk Drive Units
Commodore 1541 - Wikipedia
Review of the FC5025 5.25″ Floppy to USB Adapter « ASCII by Jason Scott
Need to pull some data off some old 5-1/4" floppy disks - Bogleheads.org