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NTFS 5.0

NTFS 5.0. By Jeffrey Richter and Luis Felipe Cabrera. From the Microsoft Systems Journal Presented by Stylianos Paparizos. Introduction. MFT Master File Table Array Similar to FAT* *File Allocation Table the File System that Microsoft uses in DOS, Windows 95/98

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NTFS 5.0

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  1. NTFS 5.0 By Jeffrey Richter and Luis Felipe Cabrera From the Microsoft Systems Journal Presented by Stylianos Paparizos

  2. Introduction • MFT Master File Table Array • Similar to FAT* *File Allocation Table the File System that Microsoft uses in DOS, Windows 95/98 • Actually 1KB entries for every file

  3. File or Directory Attributes • Standard Information • Name • Security Descriptor • Data • Named Data • Index Root, Allocation and Bitmap • Reparse

  4. Streams • Multiple Data Streams • Unnamed and named data stream • Example a .BMP file and its thumbnail • Document and its updated versions • Major disadvantage is backward compatibility with FAT, so floppy disks, cdroms don’t support this feature

  5. Hard Links • Hard Link allows a file to have multiple path names within a single volume • Example one header file in many projects • Behavior similar to UNIX since the POSIX subsystem requires it* *You can’t make a hard link of a directory

  6. File Stream Compression • NTFS can automatically compress all data streams • It breaks stream into compression units and then compresses every one of them • Major Drawbacks • CPU cost • Time cost • So it is not the default option in NTFS

  7. Sparse Streams • Large Streams with holes in them • Similar function to Compressed Streams • Easy to implement a File Queue

  8. Encrypted Streams • Protection from “bad” guys • Actually file shows up in a “dir” command but no one can actually see its contents • Always at least one recovery key • So employee can’t lock the disk when he is fired from the company!

  9. Reparse Points • Allows a piece of code to be executed when a directory is accessed • Data can be up to 16KB only • Used for creating directory junctions • Like links for directories e.g. c:\cdrom points to the actual CD-ROM drive

  10. Quotas • Disk quota support is build within the system • Max quota • Warning level • Admin tools that allow administrator to see every user’s quota data visually

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