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K Service Source Hard Drives SCSI Drives IDE Drives K Service Source Basics Hard Drive Basics IDE Drives - 1 IDE Drives Intelligent drive electronics, IDE, incorporates controller hardware into the drive. IDE is offered in 8- and 16-bit interface types. Eight-bit drives are sometimes referred to as XT interface drives, and 16-bit drives are sometimes referred to as AT interface drives. IDE drives do not use a SCSI bus. Apple computers continue to use an external SCSI chain, which is supported by a SCSI chip on the logic board. Also, Apple's HD SC Setup works with IDE drives. Basics WIDE and FAST SCSI Protocols - 2 WIDE and FAST SCSI Protocols SCSI chains that use SCSI-2 protocols are faster than SCSI chains using the original SCSI protocols. Two terms used in the SCSI-2 protocol are "WIDE" and "FAST." The term "WIDE" defines the 2-byte or 4-byte wide data interface where each data byte uses its corresponding parity bit. The traditional SCSI-1 interface protocol is 1 byte wide. "FAST" SCSI is defined as data transfer rates between 5 MHz and 10 MHz. Check these protocols against individual drives for comparative data. Devices using the SCSI-2 WIDE and FAST protocols are compatible with existing SCSI-1 devices. K Service Source Troubleshooting Hard Drive Troubleshooting General/ - 1 General The Symptom Charts included in this chapter will help you diagnose specific symptoms related to your product. Because cures are listed on the charts in the order of most likely solution, try the first cure first. Verify whether or not the product continues to exhibit the symptom. If the symptom persists, try the next cure. (Note: If you have replaced a module, reinstall the original module before you proceed to the next cure.) If you are not sure what the problem is, or if the Symptom Charts do not resolve the problem, refer to the Flowchart for the product family. For additional assistance, contact Apple Technical Support. Troubleshooting HD SC Setup/ - 2 HD SC Setup Before you replace any drive hardware, run HD SC Setup to update the driver on the drive. HD SC Setup works with SCSI and IDE drives. K Service Source Upgrades Hard Drives Upgrades Drives in Quadra 900/950 - 1