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Create a batch number with the base call number (minus the "MS") plus "BD" for born digital.

The case number for the entire Updike imaging project would be:

                              Am1793BD

For each physical item of media, the item number will be the batch number followed by an underscore and the sequential number.

For instance, the 9^th disk of 41 imaged in the John Updike collection would be given this evidence number:

                              Am1793_BD09