Dell OptiPlex Gs Service Manual (.pdf) - Page 19
Hard-Disk Drive Options, Low-Profile Computer, Midsize Computer
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Hard-Disk Drive Options Low-Profile Computer The hard-disk drive assembly (consisting of the hard-disk drive and the harddisk drive bracket) is located inside the left front area of the chassis and is attached to the bottom of the chassis. One EIDE or SCSI 1-inch-high hard-disk drive can be mounted on the hard-disk drive mounting bracket. Midsize Computer The hard-disk drive bracket is located next to the externally accessible drive bays at the front of the computer. The hard-disk drive bracket can contain either one or two 1-inch-high EIDE or SCSI hard-disk drives, or it can hold one 1-inch-high EIDE or SCSI hard-disk drive and one 1.6-inch-high EIDE or SCSI hard-disk drive. Enhanced Dual-Interface EIDE Subsystem The EIDE subsystem provides two mode-4, DMA bus-mastered EIDE interfaces, each of which can support up to two EIDE devices. The EIDE controller attaches to the high-speed PCI local bus. The primary EIDE interface (IDE1) provides support for up to two highperformance EIDE devices, such as hard-disk drives. The computer's boot drive should be connected to the primary EIDE interface. The secondary EIDE interface (IDE2) provides support for up to two additional EIDE devices, typically EIDE tape drives or CD-ROM drives. NOTE: The externally accessible drive bays at the front of the computer are normally used for diskette drives, CD-ROM drives, and/or tape drives. Harddisk drives should be installed in the internal hard-disk drive bracket described in "Hard-Disk Drive Options" found earlier in this chapter. For detailed information about the data storage subsystem, see Chapter 7, "Installing Drives," in the Reference and Installation Guide. Built-In Video Controller The video subsystem consists of a high-speed, high-resolution video controller built into the system board. Because the video controller connects to the PCI bus rather than to the ISA bus, communication between the video subsystem and the microprocessor is much faster. The PCI bus operates at a frequency of 33 MHz as compared to the 8.25-MHz operating frequency of the ISA bus. The built-in video controller includes 1 MB of video memory built into the system board, with sockets for an additional 1 MB of video memory. System Overview 1-7