Theyre the red-headed stepchildren of the digital age. Theyre neither retro chic (all things being relative, of course) like the server arrays that support big data, nor are they as cute as the thumb drives made to look like your favorite Star Wars character (or more oddly, chicken feet).
Of what do I speak? The lowly compact disc, of course. Its demise has been predicted since at least 2007, but it trudges on, becoming less and less the medium of choice for digital audio distribution (though sadly, still one of your only choices for CD-quality digital audio) but hanging on as a small-scale distribution and storage container for digital data of other sorts.
While some of you may have stopped purchasing CDs for your own listening pleasure, the Library of Congress continues to collect them in huge quantities.
For example, according to Rene Sayles, a Library Technician in the Geography and Maps division, over 700 new CDs come in every month from just one source: the National Geospatial-Intelligence Agency (and especially its Controlled Image Base series).
In addition to this cascade of new items, the Library has droves of valuable CD-only historic material already in its possession, with even more material stored on really endangered storage media such as ¼ or ½ half inch floppy discs, zip discs, mini DVDs, digital audio tape, digital linear tapes and many more. A rough estimate is that the Library has more than 300 terabytes of data stored on these devices, with the potential for it all to be locked-up when players for them no longer exist.
Sayles is part of a noteworthy project at the Library called the Tangible Media Project. TMP is working to get valuable Library digital collections off rapidly deteriorating physical (tangible) media into digital storage environments where they can be managed, backed-up and preserved for the long-term while also being made potentially more accessible.
On the one hand, TMP is a physical process with a surface simplicity that masks layers of complexity. On the other hand, TMP is a significant experiment in the reexamination of the Librarys entire digital workflow. Despite the high stakes, TMP project manager Moryma Aydelott is cheerfully copacetic about the challenges of leveraging TMP to help implement institutional change.
The ultimate goal, she says, is a generic workflow for the aggregation, bagging, transfer, inventory, access, verification and long-term storage of digital materials that can be used by multiple Library divisions. The shorter term goal, she adds with a laugh, is basically triage.
The TMP concentrates on collaborative efforts with Library division partners in the physical aspects of getting the materials off tangible items and into disc and tape storage, but thats only one aspect of how their work fits into the still-developing overall Library digital workflow.
A visit with Sayles and Aydelott in the Librarys Geography and Maps division showcases the challenges the project faces in space and time management, attention to detail and the limits of hardware and software technology.
The system is stored on a portable cart (a special request: pneumatic tires!) that Aydelott transports to different Library divisions. Geography and Maps and the European and Asian divisions are the most active at this point, but more are slowly getting involved as the word gets out on the programs success.
The TMP process starts with a tool that lets a user to load multiple CDs and have the contents of each be ripped and stored automatically without having to load the discs one at a time. Sayles demonstrates how they run through the process twice: once to capture the individual files, and once to capture an ISO image of the entire disc. The Library creates two different copies in order to hedge its bets. Will future users prefer accessible individual files or a copy of the entire disc with all the components (in some cases the data files along with specialized software required to read them) stored together in a compact whole? Only time will tell.
The Librarys goal is to make the newly ripped content as available as the original, tangible item, while also exploring ways to make the content even more available as legal and appropriate. Copies are made available to staff and patrons as permitted by Copyright law and relevant agreements. Currently, patrons can access several series of government works: other items are copied to restricted locations and made available only to staff.
Once ripped, the materials are pushed into the Content Transfer System, a Library-wide tool for receiving, moving, verifying, validating, characterizing, inventorying and auditing digital content. The CTS is the first of the Librarys internal repository services to support digital item management across the Librarys lifecycle and is undergoing rapid and continual development. The CTS model cleaves closely to the well-understood concept of file systems, where files are arranged in hierarchical directories. It adds the concept of bags, which are sets of files and directories which move through the digital lifecycle together.
CTS and TMP activities are being driven by, and feeding back into, the Librarys Digital Preservation Criteria Working Group. The DPCWGs objective is to identify current practices and policies for the preservation of digital material across the entirety of the Library and to design a path forward for workflows, practices and policies for the preservation of digital materials. The group is undertaking a multi-year effort to re-imagine the digital lifecycle at the Library based on its current strategic plan (PDF), annual objectives and performance targets and build services to more fully ensure that the Library takes advantage of institutional knowledge, collaborative opportunities and economies of scale to preserve the increasingly large amounts of digital information it is acquiring.
With all the activity going on, its no wonder that the TMP has become the public face of these initiatives within the Library. In a rapidly transforming world where digital objects are often mysteriously distant and abstract, the TMP provides a physical, tangible gateway to digital management and preservation issues.
You can see more photos of the Tangible Media Project on our Facebook page.
This post was updated on July 9, 2014 to fix a link to the strategic plan.