Context: Due to technical limitations, the original ReWritable CD could be written no faster than 4x speed. High Speed ReWritable CD has a different design, which permits writing at speeds ranging from 4x to 12x. Original CD-RW drives can only write to original ReWritable CDs. High Speed CD-RW drives can typically write to both original ReWritable CDs and High Speed ReWritable CDs. Both types of CD-RW discs can be read in most CD drives. Higher speed CD-RW discs, Ultra Speed (16x to 24x write speed) and Ultra Speed+ (32x write speed) are now available.

Question: How fast could the first ReWritable CD be written?
Answer: 4x speed

Question: Which CD has writing speeds betwen 4x and 12x?
Answer: High Speed ReWritable CD

Question: How fast can Ultra Speed+ CDs write?
Answer: 32x

Question: How fast can Ultra Speed CDs write?
Answer: 16x to 24x

Question: What has only a 1x write speed?
Answer: Unanswerable

Question: Which type of CD-RW cannot be read on a CD drive?
Answer: Unanswerable

Question: Does a High Speed CD-RW drive write faster on ReWriteable CDs or High Speed ReWritable CDs?
Answer: Unanswerable

Question: Which ReWriteable CD is most common?
Answer: Unanswerable

Question: Why was the original ReWriteable CD written only at speeds faster than 4x?
Answer: Unanswerable