CPT 499C Lecture 1 Hard Drive Access

CPT 499C Lecture 1 Hard Drive Access - DEPARTMENT OF...

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Hard Drive Access Slide 1 CIT 499C Lecture 1: Hard Drive Access
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Hard Drive Access Slide 2 Learning Objectives The student will be able to: Describe how the operating systems communicate with the hard drive Describe how “write blockers” work Differentiate between physical limitations imposed by the BIOS and logical limitations imposed by an operating system
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Hard Drive Access Slide 3 Traditional Disk Access Disk Application Program Operating System (MS-DOS) System BIOS DOS Function BIOS Function (Int 13) ATA/IDE/EIDE Disk Access
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Hard Drive Access Slide 4 Software Write Blockers Disk Application Program Operating System (MS-DOS) System BIOS DOS Function ATA/IDE/EIDE Disk Access Int 13 Hard Drive Blocker BIOS Function (Int 13) Read = OK Write = blocked
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Hard Drive Access Slide 5 BIOS Disk Access Disk Application Program System BIOS BIOS Function (Int 13) ATA/IDE/EIDE Disk Access Operating System
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Hard Drive Access Slide 6 BIOS Disk Access Disk Application Program System BIOS BIOS Function (Int 13) ATA/IDE/EIDE Disk Access Operating System What types of programs might use this access method?
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Hard Drive Access Slide 7 BIOS Disk Access Disk Application Program System BIOS BIOS Function (Int 13) ATA/IDE/EIDE Disk Access Operating System What types of programs might use this access method? Diskedit
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Hard Drive Access Slide 8 BIOS Disk Access Is the drive “write protected”? Disk Application Program System BIOS ATA/IDE/EIDE Disk Access Int 13 Hard Drive Blocker BIOS Function (Int 13) Read = OK Write = blocked Disk Application Program System BIOS BIOS Function (Int 13) ATA/IDE/EIDE Disk Access Operating System Operating System
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Hard Drive Access Slide 9 BIOS Disk Access Is the drive “write protected”? Disk Application Program System BIOS ATA/IDE/EIDE Disk Access Int 13 Hard Drive Blocker BIOS Function (Int 13) Read = OK Write = blocked Disk Application Program System BIOS BIOS Function (Int 13) ATA/IDE/EIDE Disk Access Operating System Operating System YES
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Hard Drive Access Slide 10 Controller Disk Access Disk Application Program ATA/IDE/EIDE Disk Access Operating System System BIOS
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Slide 11 Controller Disk Access Disk Application Program ATA/IDE/EIDE Disk Access Operating System System BIOS What types of programs might use this access method? Imaging Utilities
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This note was uploaded on 02/29/2012 for the course CNIT 499 taught by Professor Timwedge during the Fall '07 term at Purdue.

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CPT 499C Lecture 1 Hard Drive Access - DEPARTMENT OF...

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