Lenovo PC 300GL Understanding Your Personal Computer 6267, 6277, 6287 - Page 42

CD-ROM Drives, that stores various formats of audio and video information.

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IDE Your computer has a PCI-to-IDE interface that complies with the AT-attachment interface. This interface includes the original IDE (ATA) interface with extensions for Ultra DMA-33. The original IDE interface specification refers to a hard disk drive with a built-in controller (as opposed to a hard disk drive with a separate controller). Two IDE connectors are provided on the system board. One connector is designated as primary and the other as secondary. Your computer system board can accommodate up to two IDE drives attached to each connector. However, the PC 300GL only supports a total of three IDE devices. When you connect two hard disk drives to the same ribbon cable, the two drives could potentially send and receive data at the same time (because each drive has its own controller). To prevent the drives from competing for priority, you must designate one drive as the primary (master) drive, and the other as the secondary (subordinate) drive. This is determined by switch or jumper settings on each hard disk drive. If only one hard disk drive is attached to either the primary or secondary IDE connector, it must be designated as the master drive. SCSI Some computers have a SCSI (small computer system interface) hard disk drive connected to an optional SCSI adapter. SCSI can be faster than IDE, particularly when used with a multitasking operating system, such as Microsoft Windows 95, Windows 98, and Windows NT. With SCSI, instructions can be sent concurrently to every drive in the system, and the drives can then execute these instructions simultaneously. This is not possible with IDE. SCSI is well suited for computers in which expandability is important. CD-ROM Drives An IDE compact disc-read only memory (CD-ROM) drive uses a removable compact disc (CD) that stores various formats of audio and video information. A CD-ROM drive can play back or read from a CD, but it cannot write information to it. The information on the CD can be heard or viewed, but not changed or updated as it can on a diskette, hard disk, or tape. CD-ROM technology offers quick access to enormous amounts of information. Diskettes, hard disks, and tapes are magnetically recorded. CDs are optically recorded at a much higher density. CD-ROM drives use industry-standard 12 cm (4.75 in) CDs with formatted capacities of approximately 650 MB of data. CDs are used for music, voice, animated graphics, multimedia, education, software distribution, and many other applications. To hear music or voice from a CD, you can utilize the built in speaker or, if your model has an audio controller, connect headphones or powered speakers. Some models come with an IBM-preinstalled CD-ROM drive. 34 Storage Devices

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IDE
Your computer has a PCI-to-IDE interface that complies with the AT-attachment interface.
This interface includes the original IDE (ATA) interface with extensions for Ultra DMA-33.
The original IDE interface specification refers to a hard disk drive with a built-in controller
(as opposed to a hard disk drive with a separate controller).
Two IDE connectors are
provided on the system board.
One connector is designated as primary and the other as
secondary.
Your computer system board can accommodate up to two IDE drives attached
to each connector.
However, the PC 300GL only supports a total of three IDE devices.
When you connect two hard disk drives to the same ribbon cable, the two drives could
potentially send and receive data at the same time (because each drive has its own
controller).
To prevent the drives from competing for priority, you must designate one
drive as the primary (master) drive, and the other as the secondary (subordinate) drive.
This is determined by switch or jumper settings on each hard disk drive.
If only one hard
disk drive is attached to either the primary or secondary IDE connector, it must be
designated as the master drive.
SCSI
Some computers have a
SCSI (small computer system interface)
hard disk drive connected to
an optional SCSI adapter.
SCSI can be faster than IDE, particularly when used with a
multitasking operating system, such as Microsoft Windows 95, Windows 98, and Windows
NT.
With SCSI, instructions can be sent concurrently to every drive in the system, and the
drives can then execute these instructions simultaneously.
This is not possible with IDE.
SCSI is well suited for computers in which expandability is important.
CD-ROM Drives
An
IDE compact disc-read only memory (CD-ROM)
drive uses a removable compact disc (CD)
that stores various formats of audio and video information.
A CD-ROM drive can play
back or read from a CD, but it cannot write information to it.
The information on the CD
can be heard or viewed, but not changed or updated as it can on a diskette, hard disk, or
tape.
CD-ROM technology offers quick access to enormous amounts of information.
Diskettes,
hard disks, and tapes are magnetically recorded.
CDs are optically recorded at a much
higher density.
CD-ROM drives use industry-standard 12 cm (4.75 in) CDs with formatted
capacities of approximately 650 MB of data.
CDs are used for music, voice, animated
graphics, multimedia, education, software distribution, and many other applications.
To hear music or voice from a CD, you can utilize the built in speaker or, if your model has
an audio controller, connect headphones or powered speakers.
Some models come with an IBM-preinstalled CD-ROM drive.
34
Storage Devices