A StrongHold bag is a brand of Faraday bag, an enclosure specifically designed to block electromagnetic fields and radio frequency (RF) signals. In a digital forensics context, the primary use of a Faraday bag is to isolate seized electronic devices that have wireless capabilities (e.g., Cellular, Wi-Fi, Bluetooth, GPS) from external communication networks. This is a critical step to preserve evidence integrity by preventing remote commands, such as data wiping, alteration, or location tracking, from reaching the device. A Personal Digital Assistant (PDA), as a mobile device with these wireless capabilities, is a textbook example of equipment that must be stored in such a bag immediately upon seizure.

B. Backup tapes: These are magnetic storage media without any wireless communication capabilities; they do not require RF shielding.
C. Hard drives: Standard hard drives are storage components that lack inherent wireless transceivers and do not need to be placed in a Faraday bag.
D. Wireless cards: While a wireless card enables RF communication, forensic procedure prioritizes isolating the entire active device (which contains the card) rather than just a single component.

1. National Institute of Standards and Technology (NIST). (2014). Special Publication 800-101 Revision 1: Guidelines on Mobile Device Forensics. Section 3.3.1, "Seizure," Page 19. The document states, "As soon as a mobile device is seized, it should be isolated from all communication networks. If the device is on, disabling network communications can be accomplished by placing it in a Faraday bag..." This directly supports placing mobile devices like PDAs in these bags.

2. Ayers, R., Brothers, S., & Jansen, W. (2014). Guidelines on Mobile Device Forensics (NIST Special Publication 800-101 Rev. 1). National Institute of Standards and Technology. Page 19. (This is the full citation for the above reference, available via its DOI). https://doi.org/10.6028/NIST.SP.800-101r1

3. Kent, K., Chevalier, S., Grance, T., & Dang, H. (2006). Guide to Integrating Forensic Techniques into Incident Response (NIST Special Publication 800-86). National Institute of Standards and Technology. Section 3.3.3, "Collecting Network-Based Evidence," discusses the need to capture and preserve volatile data from wireless devices, a process facilitated by isolating the device in a Faraday bag.