Microfilm and microfiche are both stored in the Reader Room, along with the equipment to use them. All microfilm and microfiche are non-circulating and must be used on-site.
There are 2 manual film readers, 1 fiche reader, and a film/fiche reader attached to a computer to allow copies of displayed page. The copy of that page may then be printed, copied to a flash drive or CD, or emailed to one's self. There's also a flatbed scanner, to use to copy a page or more; once scanned, image can be printed or copied to a flash drive.
Many microfilms listed in the MCGS Research Library are those on permanent loan from the Family History Library (FHL)
in Salt Lake City. Other users of the FHC paid to retain these films at this site. The FHL permanent microfilms are between the top and bottom drawers of the file cabinet. Use the MCGS Call# to locate an item. See the Catalog page on this website for a list of films. Also see the FamilySearch article.
All the microfiche collection is from the FHL and all are on permanent loan.* The fiche are filed in the top of the film cabinet. Other films were purchased by MCGS from the National Archives (NARA) or the County of Marin. The FHL or NARA number is on the fiche or film box. The Type/Location field from the MCGS Library Catalog identifies the item as a book, periodical, or other media.
Also check the MCGS article about using WorldCat and/or Family History Library catalog.