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A '''forensic disk controller''' or '''hardware write-block device''' is a specialized type of computer [[hard disk controller]] made for the purpose of gaining read-only access to computer [[hard drive]]s without the risk of damaging the drive's contents. The device is named [[forensics|forensic]] because its most common application is for use in investigations where a computer hard drive may contain evidence. Such a controller historically has been made in the form of a [[dongle]] that fits between a computer and an [[Integrated Drive Electronics|IDE]] or [[SCSI]] hard drive, but with the advent of [[Universal Serial Bus|USB]] and [[Serial ATA|SATA]], forensic disk controllers supporting these newer technologies have become widespread. Steve Bress and Mark Menz invented hard drive write blocking (US Patent 6,813,682). <ref>https://patents.google.com/patent/US6813682B2/en</ref>
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A device which is installed between a storage media under investigation and an investigator's computer is called a "'''bridge Kit'''." The bridge kit has one connector for the storage media and another connector the investigator's computer. It allows the investigator to read, but not alter the device under investigation.<ref name="dhs">{{cite web |title=Test Results for Hardware Write Block Device: Tableau Forensic SATA/IDE Bridge T35u |date=October 2018 |publisher=[[United States Department of Homeland Security]] |url=https://www.dhs.gov/sites/default/files/publications/Test%20Report_NIST_HWB_Tableau%20Forensic%20SATA-IDE%20Bridge%20T35u_Firmware%20Version%20Sep%2015%202015%2011.19.41_October%202018.pdf |accessdate=February 23, 2021}}</ref>
The United States [[National Institute of Justice]] operates a Computer Forensics Tool Testing (CFTT) program which formally identifies<ref>http://www.cftt.nist.gov/HWB-ATP-19.pdf</ref> the following top-level tool requirements:
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