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Two-in-one optical drive, what do you mean?
"Combination CD-ROM" means that this device can perform the following operations:

1, which can read ordinary optical discs and realize the function of optical drive.

2. You can read ordinary DVD and realize the function of DVD-ROM.

3. you can burn CD-R or CD-RW discs to realize the function of CD burner.

Also, every brand has COMBO series CDs. ..