compact disk-read-only memory
"Confiscate 21000 CDs (compact disks), VCDs (video compact disks), LDs(laser disks)and videotapes (Note: LDs are larger than VCDs)"
record digitally, as of compact disks.
If you Buy a music centre,you get some compact disks thrown in :If you Buy a music centre,you get a premium of some compact disks,free.
It fits all 20 volumes, 21,728 pages, all 2.4 million quotations on one CD-ROM disk identical in appearance to a music compact disk.
Phase-shifting interferometry to the flatness of a compact disk