It doesn't seem necessary to repeat "protocol information" as the document names/descriptions usually indicate the information in their contents, e.g. "Informed Consent Form dated..."
Instead, "CD-ROM [or CD, depending on source] containing items # - #" should be able to appropriately convey the meaning without redundancy, as used in the provided web reference.

Also, แผ่น should be "disc", not "disk":
(From Apple Inc.): What's the Difference between a "Disc" and a Disk"?

Discs
A disc refers to optical media, such as an audio CD, CD-ROM, DVD-ROM, DVD-RAM, or DVD-Video disc. Some discs are read-only (ROM), others allow you to burn content (write files) to the disc once (such as a CD-R or DVD-R, unless you do a multisession burn), and some can be erased and rewritten over many times (such as CD-RW, DVD-RW, and DVD-RAM discs).
All discs are removable, meaning when you unmount or eject the disc from your desktop or Finder, it physically comes out of your computer.

Disks
A disk refers to magnetic media, such as a floppy disk, the disk in your computer's hard drive, an external hard drive. Disks are always rewritable unless intentionally locked or write-protected. You can easily partition a disk into several smaller volumes, too.
Disks are usually sealed inside a metal or plastic casing (often, a disk and its enclosing mechanism are collectively known as a "hard drive").

If the term appears in a numbered list, the name - quantity format should be kept as per source order/format. For example:
"CD containing protocol items 1 and 2 1 disc"
If listed in a sentence, then it might be clearer to state as:
"One CD containing items 1 and 2".