1) Yes. You need to record your cassette into digital format first. That´s usually done with a software that digitizes the analog audio input and writes a WAV or AIFF file. Then burn the file(s) to a CD
(most burning softwares can do the necessary conversions).
disks can be re-recorded multiple times, but not exactly like a floppy disk. Handling depends on the driver software in your system. You should normally make a copy to your harddisk for editing and only update the CD
when finished for the day. CD
-RWs "wear out" a little bit every time they are written to, and they are not quite as "safe" for long-time storage as CD
-Rs (write-once) are.
It´s definitely a good idea to make more than one copy of your important data so you´ll have a backup when the main copy should not be usable any more.
touch the surface of a CD
, except when cleaning them (carefully). Only hold it by the edge. Especially audio
CDs are quite durable, but a data CD
is more easily damaged (and usually more valuable).