A writable disk is a disk in which you can write (ie., store) data onto. The majority of diskettes are writable, and so are blank CDs and DVDs. Computer hard drives are generally writable as well.
I cannot imagine that they would as commercially prerecorded CDs are not writable.
Low cost Re-writable
no
its either a re-writable disk or its not!
3/4 of a gigabyte is the capacity of a standard writable CD.
It has to be a DVD-RW or DVD+RW. R means Writable, RW means Re-Writable.
CD-RW (Compact Disk Re-Writable)
BD-R and BD-RE
If you just have a DVD ROM (Read Only Memory) there is no way to convert it to writable or re-writable (no method reasonable without re engining the hardware from scratch). You need to buy a new DVD RW drive. Good news is that these are very inexpensive now.
BD-R and BD-RE
All CD's and DVD's are read-only unless they are specified "re-writable".