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[[File:Forensic disk imager.jpg|thumb|220x220px|A Tableau forensic disk imager]]
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>
A device which is installed between a storage media under investigation and an investigator's computer is called a "bridge Kit." The bridge 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 |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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