Try to give the disk a different ID every time. If you write to a disk with the same ID as a previous disk, you just may corrupt the second disk. It only works on disks that have been previously formatted. There's no telling what goodies you might run across in each issue. GEOS includes a word processor for writing letters, a paint program for creating art, and other nice accessories.
GEOS accessories are usually very reliable.
The salesperson who sold you your computer and drive probably tried to convince you that a cartridge was supposed to make life easier, stop all war, and end world hunger. A naked Commodore 64 is a slow and unfriendly beasty that's not efficiently interfaced with its disk drive. The Commodore 64 wasn't designed with disk drives in mind. Your 1541 would normally read at about 512 characters per second. Today programs are longer and more sophisticated.