A DVR records images directly to a conventional computer hard drive as bits of data, instead of recording analog images to a moving medium like VHS tape. This is fundamentally the same as that used in consumer products like TiVo and Ultimate TV. Digitally stored images can be preserved indefinitely and can be replicated without loss of quality. DVRs also allow for simultaneous recording and playback, better picture quality than that of tape, and stored data can be searched quickly using a wide variety of parameters. Digital closed circuit television (CCTV) is one of the fastest growing segments of the security industry. Until there is a set standard for the recording or retrieval of digital video images, law enforcement will have a difficult time dealing with the variety of file formats, compression algorithms, and export protocols. Most law enforcement agencies will find themselves ill equipped to handle the evidence collected by these devices. Evidence recovery and storage problems can occur when a responding officer or investigator cannot gain access to a copy of what is stored in a DVR in a reasonable amount of time. With no videotape to place into safekeeping and no way to gain access to the images recorded on the DVR hard drive, DVRs will be subject to long-term seizure by law enforcement. Digital recording is a relatively new technology and is in a state of constant flux and evolution. Much of the security industry is not educated as to how a DVR is installed and operated. DVRs are sensitive electronic components that are vulnerable to power spikes and electrical interruptions and need to be handled accordingly. To avoid problems in collecting and handling digital video evidence, law enforcement agencies can do some preventive work, such as establishing a security ordinance and communicating with the security companies.