CPT 499C Lecture 5 Dates and Times in FAT

CPT 499C Lecture 5 Dates and Times in FAT - DEPARTMENT OF...

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Date and Time in FAT Slide 1 Date and Time information on FAT file systems
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Date and Time in FAT Slide 2 Learning Objectives The student will be able to: Identify Operating System rules for changing Date and Time info. Modification Access Creation Track changes to system date and time
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Date and Time in FAT Slide 3 WIN 9X / ME Bytes 1-8 Filename Bytes 9-11 Extension Byte 12 Attribute Byte 13 NT Info Bytes 14-16 Creation Time Bytes 17-18 Creation Date Bytes 19-20 Access Date Bytes 21-22 Cluster High Bytes 23-24 Mod. Time Bytes 25-26 Mod. Date Bytes 27-28 Starting Cluster Bytes 29-32 File Size DOS 6.22 Bytes 1-8 Filename Bytes 9-11 Extension Byte 12 Attribute Byte 13 Unused Bytes 14-16 Unused Bytes 17-18 Unused Bytes 19-20 Unused Bytes 21-22 Unused Bytes 23-24 Mod. Time Bytes 25-26 Mod. Date Bytes 27-28 Starting Cluster Bytes 29-32 File Size FAT Directory Structure
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Date and Time in FAT Slide 4 Date Bits • 7 Bits Year Since 1980 (0-127) • 4 Bits Month (1-12) • 5 Bits Day of Month (1-31) Time Bits • 5 Bits Hour (0-23) • 6 Bits Minute (0-59) • 5 Bits Second/2 (0-29) ** Creation time has a third byte, # of 10 millisecond intervals out of two seconds to add to time (0-199) . Directory Structure
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Date and Time in FAT Slide 5 Directory Entry (hex view) Creation Time
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Date and Time in FAT Slide 6 Directory Entry (hex view) Creation Date
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Date and Time in FAT Slide 7 Directory Entry (hex view) Access Date
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Date and Time in FAT Slide 8 Directory Entry (hex view) Modification Time
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Date and Time in FAT Slide 9 Directory Entry (hex view) Modification Date
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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 5 Dates and Times in FAT - DEPARTMENT OF...

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