The Commodore 1541 Disk Drive allowed the use of floppy disk, rapidly speeding up load times in comparison to Tape based software. A C64 Floppy Disk had a whopping 170Kb of storage space per side. Often people used a 'Disk Notcher' or Hole Punch to enable the second side of the disk to be used.
A lot of software, games, and utilities were released on disk format for the Commodore 64, and you can still find a wide range available, both in physical format, and in online archives. Many people 'copied' disks, and thus there's a load of C64 Disk Collections out there that are made up vasty of copies. Whilst this was seen to be illegal, it was a common practice.
Today you can still purchase Disks for the Commodore 64 Be wary that being a magnetic medium, the age of these disks tends to produce a small failure rate. Try to find Disks in great condition, still in the box, in original format.
COMMODORE 64 128 1541 1571 ALIGNMENT PRO...
COMMODORE 64 COMPUTER KEYBOARD 2 COMMOD...
KARATEKA COMMODORE 64 ATARI 525 FLOPPY D...
RAID OVER MOSCOW COMMODORE 64 DISK CASE
VINTAGE COMMODORE 64 DISK SOFTWARE MANU...
COMMODORE 64 DISK LOAD COMM DECAL STICKE...
COMMODORE 64 GAMES LABYRINTH FLOPPY DISK
LODE RUNNER BY BRODERBUND ON FLOPPY DISK...
COMMODORE 1541 FLOPPY DISK DRIVES FOR CO...