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File Formats for Long-Term Access

The file format in which you keep your data is a primary factor in one's ability to use your data in the future.

As technology continually changes, researchers should plan for both hardware and software obsolescence. How will your data be read if the software used to produce them become unavailable?

Formats more likely to be accessible in the future are:

  • Non-proprietary
  • Open, documented standard
  • Common usage by research community
  • Standard representation (ASCII, Unicode)
  • Unencrypted
  • Uncompressed

Consider migrating your data into a format with the above characteristics, in addition to keeping a copy in the original software format.

File Version Control

Keeping track of versions of documents and datasets is critical. Strategies include Directory Structure Naming Conventions and File Naming Conventions (see below for more information). Always record every change to a file no matter how small. Discard obsolete versions after making backups.

Directory Structure Naming Conventions

When organizing files, directory top-level folder should include the project title, unique identifier, and date (year).

The substructure should have a clear, documented naming convention; for example, each run of an experiment, each version of a dataset, and/or each person in the group.

File Naming Conventions

File Renaming Resources

Use free tools to help you rename files:

Data Identifiers for Sharing Your Data

If you want your data to be found and cited, you need to place your data where other people can find it and use identifiers to allow your data to be easily referenced. Data identifiers must be globally unique and persistent. That is to say, they must not be repeated elsewhere and they must not change over time.

Here are a couple general data identifiers:

  • PURL -- A PURL is a Persistent Uniform Resource Locator. Functionally, a PURL is a URL. However, instead of pointing directly to the location of an Internet resource, a PURL points to an intermediate resolution service. The PURL resolution service associates the PURL with the actual URL and returns that URL to the client.
  • DOI -- A DOI (Digital Object Identifier) is a name (not a location) for an entity on digital networks. It provides a system for persistent and actionable identification and interoperable exchange of managed information on digital networks.
  • URI -- Uniform Resource Identifier (URI) consists of a string of characters used to identify or name a resource on the Internet. Such identification enables interaction with representations of the resourcee over a network, typically the World Wide Web, using specific protocols.

Here are a couple domain specific identifiers:

  • ACCESSION -- Accession numbers used by the National Center for Biotechnology Information (NCBI) are unique and citable.
  • InChi -- The IUPAC International Chemical Identifier (InChiTM) is a non-proprietary identifier for chemical substances that can be used in printed and electronic data sources thus enabling easier linking of diverse data compilations.

This material adapted from MIT Libraries, California Digital Library/UC3, and University of Oregon Libraries, used under a Creative Commons Attribution-Share Alike license: http://creativecommons.org/licenses/by-sa/3.0/.