1 / 13

File Systems

File Systems. Objectives. Differences between major file systems Understand why different types of media have different file systems Which file system to use on hard drive or floppy File attributes. Purpose of a File System. Organizes data on hardware storage system

gwen
Download Presentation

File Systems

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. File Systems

  2. Objectives • Differences between major file systems • Understand why different types of media have different file systems • Which file system to use on hard drive or floppy • File attributes

  3. Purpose of a File System • Organizes data on hardware storage system • Acts as interface to enable the system and applications to use data that is stored • Different types of storage media require different types of formatting

  4. Important Terms • Volume • Sector • Cluster • FAT

  5. FAT File Systems • File allocation table- table to keep track of stored data on a hard drive. • A backup copy is stored on the root directory of the primary partition • FAT12, FAT16, FAT32….number of bits needed to make a single FAT entry • Most widely used file system

  6. FAT16 vs. FAT32 • FAT32-limited compatibility • FAT32- cannot use boot MS-DOS boot disk to boot system and access files in case crash • FAT32 allocates disk space more efficiently i.e. more data can be stored • FAT32 automatically uses the backup copy of FAT if original corrupted

  7. FAT16 vs. FAT32 • FAT32 provides a backup of the boot sector • FAT32 supports drives up to 2 TB, largest volume size is 32GB- FAT16 up to 2GB • FAT16/FAT32- no data compression or encryption • FAT16 8.3 naming-FAT32 supports long file names

  8. FAT16 vs. FAT32 • FAT32 small cluster size allows for faster loading of applications and data • Dual boot possible FAT16 with DOS and Windows • Dual boot not possible FAT32 with non-FAT32 supported O/S • FAT16 can be converted to FAT32 but not back to FAT 16

  9. Selecting a File System When choosing the appropriate file system to use, you need to determine: If the computer has a single operating system or is a multiple-boot system.On computers that contain multiple operating systems, file system compatibility can be complex because different versions of Windows support different combinations of file systems. The number and size of locally installed hard disks. Each file system has a different maximum volume size. As volume sizes increase, your choice of file systems becomes limited. For example, both FAT32 and NTFS can read volumes larger than 32 GB; however only NTFS can be used for format volumes larger than 32 GB in Windows XP Professional. Security considerations. NTFS offers security features, such as encryption and file and folder permissions. These features are not available on FAT or FAT32 volumes. If you benefit by using advanced file system features. NTFS offers features such as disk quotas, distributed link tracking, compression, and mounted drives. These features are not available on FAT or FAT32 volumes.

  10. NTFS advantages • Enhanced file allocation table Master File Table (MFT) • Permissions system for files and folders (Refer to Page 404 for full description) • Allows compression of files and folders. Save space. • Disk Administrator allows you to change the size of individual volumes

  11. Using NTFS Reliability NTFS uses log file and checkpoint information to restore the consistency of the file system when the computer is restarted. In the event of a bad-sector error, NTFS dynamically remaps the cluster containing the bad sector and allocates a new cluster for the data. NTFS also marks the cluster as bad and no longer uses it. Greater security: NTFS files use Encrypting File System (EFS) to secure files and folders. If enabled, files and folders can be encrypted for use by single or multiple users. The benefits of encryption are data confidentiality and data integrity, which can protect data against malicious or accidental modification. NTFS also enables you to set access permissions on a file or folder. Permissions can be set to Read Only, Read and Write, or No Access. Improved management: NTFS supports the use of disk quotas. Disk quotas enable you to specify the amount of disk space that is available to a user. By enabling disk quotas, you can track and control disk space usage. You can configure whether users are allowed to exceed their limits, and you can also configure Windows XP Professional to log an event when a user exceeds a specified warning level or quota limit. With NTFS you can easily create extra disk space by compressing files, extending volumes, or mounting a drive. File compression is also discussed in this module.of storage growth Support for larger volume sizes : Theoretically, you can format a volume up to 32 exabytes by using NTFS. NTFS also supports larger files and a larger number of files per volume than FAT or FAT32. NTFS also manages disk space efficiently by using smaller cluster sizes. For example, a 30-GB NTFS volume uses 4-KB

  12. NTFS disadvantages • NTFS volumes can’t be accessed by MS-DOS, Win 9x • Slower performance for very small volumes (under 400 MB)

  13. File System Size Limitations • Size of volume to be formatted is directly related to which O/S can be used with which file system (refer to table page 402-403)

More Related