FIPS (Federal Information Processing Standards) is a requirement for all encryption products used by U.S. government workers and government contractors. FIPS validations are given by the National Institute of Standards and Technologies (NIST).

As of March 2017, the DataLocker DL2 (Formally DataLocker Enterprise) and the H350 are the only external hard drives in the market that have a FIPS 140-2 validation, which covers the entire storage device. All other commercially available encrypted external hard drives utilize FIPS 140-2 validated cryptographic modules which are used within the storage. This is commonly referred to as "FIPS Validated Crypto" or "FIPS Inside". 

DataLocker DL2 (Formally DataLocker Enterprise):
The DataLocker DL2 (Formally DataLocker Enterprise)has two validations. One for the entire device, certificate #1504 (PDF) and it is also covered by certificate #1472 for the MX crypto module which this drive utilizes. 
See attachments

DataLocker DL3 FE:
The DL3 FE utilizes a FIPS 140-2 validated cryptographic processor. It is the same  MX 
crypto module which is validated per certificate #1472.

Sentry 3 FIPS:
The Sentry 3.0 FIPS is FIPS 140-2 validated per 
certificate #2753. (PDF)

SafeCrypt is FIPS 140-2 validated per certificate #819. (PDF)

EncryptDisc is FIPS 140-2 Validated per 
certificate #819. (PDF)

H350 is FIPS 140-2 Validated per 
certificate #2826. (PDF)