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A 40-conductor/40-pin cable, sufficient only for ATA/33 and slower
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An 80-conductor/40-pin cable, required for ATA/44 and faster
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If you ignore these color codes, you may have problems with the BIOS not recognizing a hard drive, or worse, data corruption Placing a single drive on the middle connector leaves a pigtail of unterminated wire that will result in reflected signals and degradation in signal quality Mixed Hard Drive Types You can place drives with different ratings on the same cable If you are using an ATA/100 host controller and have ATA/33 and ATA/100 hard drives connected via an 80-conductor cable, each drive will perform at its rated speed And if you have an ATA/33 host controller with ATA/33 and ATA/100 hard drives, the fastest transfer speed you could attain would be approximately 33MB/second Mixed Cable Types Mixing cable types is a proven way to cause problems If you must daisy-chain IDE cables (not exceeding the 18-inch limit), ensure that both cables are of the identical type The ATA host controller will detect the type of cable connected to each bus by checking the PDIAG-CBLID signal on pin 34 (The PDIAG-CBLID pin is the Passed Diagnostics-Cable Assembly Type Identifier, just so you know if it ever comes up in a future Jeopardy show) If pin 34 is tied to ground, the controller knows that an 80-conductor cable is attached Incidentally, this is also why it is important to make sure that the blue connector is mated with the host controller, because this is where the pin is grounded You may be wondering when the problem of mixed cable types may arise Until recently, companies that assemble computer systems for forensic use have had a hard time finding a source for an 80-conductor version of the short extension cable that allowed them to place a male IDE connector on the back of the computer system We observed several situations where an 80-conductor cable was mated to the backplane, causing the host controller to go into ATA/100 mode Because of the lack of shielding on the 40-conductor cable inside the computer, the BIOS had intermittent problems identifying external drives Figure 10-3 illustrates this condition Cable Select Mode If you are a fan of the cable select mode capability, you finally have something to cheer about The entire IDE/ATA system is now designed for cable select mode to operate as initially planned (assuming the hard drives themselves cooperate) This mode allows the user to place the hard drives on the ATA cable without setting jumpers One would place the master at the end of the cable, and the slave at the midpoint We are fans of making things behave in a predictable manner, so we usually lock the drives down to master and slave by setting the jumpers to the manufacturer s specifications These specifications may be found printed on the label or in the documentation included with the hard drive
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ATA Bridges
There are a multitude of reasons for using ATA host bridges, such as IDE-to-SCSI, IDE-to-IEEE 1394 (FireWire), and IDE-to-USB 11 or 20 bridges For forensic examiners, the two primary benefits of using an ATA host bridge are the availability of hardwarebased write protection and the capability to hot-swap hard drive media
Incident Response & Computer Forensics
40 Pin
80 Pin
Figure 10-3
An 80-conductor cable meeting a 40-conductor cable can cause problems
In the past, we protected hard drives from alteration by using software-based interrupt 13 write-protection programs Although this approach worked quite well during Safeback and Snapback duplication sessions, it was widely known that there were other methods of writing to a disk that did not use DOS-based interrupts Several companies began offering products that would intercept data transferred to the drive during write operations The concept of ATA bridges made this solution easier to implement If you are able to add ATA host bridges to your toolkit, you should purchase models that convert to IEEE 1394 (FireWire) or USB 20 and are compatible with your processing environment (Windows or Unix) Some manufacturers have engineered interfaces that have a hardware-based write protection feature We strongly recommend adding this extra layer of protection to your evidence processing workflow
GO GET IT ON THE WEB WiebeTech ATA-to-FireWire bridges: http://wiebetechcom Forensic-Computers ATA-to-FireWire bridges: http://wwwforensic-computerscom
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