Lenovo PC 300GL Technical Information Manual 6272, 6282 - Page 41
Diskette Drives and Controller, Hard Disk Drives and Controller
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Chapter 6. System Compatibility Diskette Drives and Controller The following figures show the reading, writing, and formatting capabilities of each type of diskette drive. Figure 34. 5.25-Inch Diskette Drive Reading, Writing, and Formatting Capabilities Diskette Drive Type 250/500 KB Mode 300/500 KB Mode Single sided (48 TPI) RWF - Double sided (48 TPI) RWF RWF High capacity (1.2 MB) RWF RWF 1 MB Mode - - RWF Figure 35. 3.5-Inch Diskette Drive Reading, Writing, and Formatting Capabilities Diskette Drive Type 720 KB Mode 1.44 MB Mode 1.44 MB drive RWF RWF 2.88 MB drive RWF RWF 2.88 MB Mode - RWF Notes: 1. Do not use 5.25-inch diskettes that are designed for the 1.2MB mode in either a 250/500 KB or 300/500 KB diskette drive. 2. Low-density 5.25-inch diskettes that are written to or formatted by a high-capacity 1.2 MB diskette drive can be reliably read only by another 1.2 MB diskette drive. 3. Do not use 3.5-inch diskettes that are designed for the 2.88 MB mode in a 1.44MB diskette drive. Copy Protection The following methods of copy protection might not work in systems using the 3.5-inch 1.44 MB diskette drive. Bypassing BIOS routines: - Data transfer rate: BIOS selects the proper data transfer rate for the media being used. - Diskette parameter table: Copy protection, which creates its own diskette parameter table, might not work in these drives. Diskette drive controls: - Rotational speed: The time between two events in a diskette drive is a function of the controller. - Access time: Diskette BIOS routines must set the track-to-track access time for the different types of media that are used in the drives. - 'Diskette change' signal: Copy protection might not be able to reset this signal. Write-current control: Copy protection that uses write-current control does not work, because the controller selects the proper write current for the media that is being used. Hard Disk Drives and Controller Reading from and writing to the hard disk is initiated in the same way as in IBM Personal Computer products; however, new functions are supported. Chapter 6. System Compatibility 29