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Fourth, an MD5 checksum is calculated by reading the registered file if it is in local storage. If the registered file is in remote storage (say, SRB) a checksum is calculated on just the file name! This is an efficiency choice since registering a large number of large files that are in SRB would consume substantial network resources and time. A future option could be to have an SRB proxy process calculate MD5s and store them in SRB's metadata catalog (MCAT) for rapid retrieval. SRB offers such an option but it's not yet in production release.

Registered items and their bitstreams can be retrieved transparently just like normally ingested items.

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