A computer disk in a dream could suggest a great deal of information and knowledge is available to us.
A compact disc can have a similar significance except that its content, being musical, is more recreational that work-oriented. This could indicate that, in waking life, we need to be aware of our need for relaxation.
The disk in a dream has the same significance as the sun, and represents perfection and the renewal of life.
Divinity and power are represented spiritually by the disk.... Ten Thousand Dream Dictionary
Psychological / emotional perspective: The disk in a dream has emotionally the same significance as the sun, and can be considered both as a powerful source of information and initially of life itself.... Dream Meanings of Versatile
Material aspects: A computer disk suggests that there is a great deal of information and knowledge available to us. As other forms of storage become available such knowledge enters the realms of the everyday.... Dream Meanings of Versatile
A diskette holds data, which may be transferred into a computer’s hard drive or run without storing it. Thus, metaphorically it may represent information given to you tha: you can use and incorporate for a time but you don’t necessarily have to buy into forever. It also may represent information or ideas that you pass on to someone else.... Ariadne's Book of Dream