HP Dc7100 HP Compaq Business Desktop dc7100 Series Service Reference Guide, 3r - Page 63
PATA Drive Installation Guidelines, 4.3.1 PATA Device Classes
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Serial and Parallel ATA Drive Guidelines and Features 4.3 PATA Drive Installation Guidelines Most computer system boards have two or fewer Parallel ATA (PATA) channels with a dedicated connector for each channel. When two channels are present, one is designated as the Primary and the other as the Secondary Channel. Each of the two channels can have up to two devices attached to it. All drives are connected to a channel using an industry-standard 80-conductor cable. ✎ The industry standard 1.44 MB diskette drive has its own separate channel and is not included as a part of the maximum four drives. HP does not support the use of PATA (IDE) hard drives when SATA hard drives are installed on the computer. Each drive attached to a channel must have a drive designation. If a drive is attached to the Device 0 cable position and its cable-select jumper is present, the drive is designated as Device 0. Similarly, if a drive is attached to the Device 1 cable position and its cable-select jumper is present, the drive is designated as Device 1. For optimal performance of a computer system, all drives need to be attached to the PATA channel(s) in a specified sequence. This sequence is determined by the device class of the drives and by specific attach sequence rules. 4.3.1 PATA Device Classes In order to determine the best drive attach sequence, ATA/ATAPI drives are segregated into four different classes based upon the bandwidth demands they place on an ATA channel. The most demanding devices are in Class 1 and the least demanding are in Class 4. Class 1 Hard Drives ATA-100 ATA-66 ATA-33 Class 2 High Speed Optical Drives DVD DVD-CD R/W Class 3 Optical Storage Drives R/W CD-ROM CD-ROM Class 4 Magnetic Storage Drives LS-120 Tape Zip General Attach Guidelines ■ The lower the device class number, the faster the device and the more bandwidth required. ■ Drives installed in the Device 0 positions on both the primary and secondary channels receive the greatest possible bandwidth. ■ The bootable ATA hard drive should always be installed on the primary channel in the Device 0 position. Service Reference Guide, dc7100 361288-003 4-5