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- DOCUMENT:Q101267 24-AUG-1993 [W_NT]
- TITLE :INF: Files Are Larger on FAT Partitions
- PRODUCT :Windows NT
- PROD/VER:3.10
- OPER/SYS:WINDOWS
- KEYWORDS:
-
- --------------------------------------------------------------------
- The information in this article applies to:
-
- - Microsoft Windows NT operating system version 3.1
- - Microsoft Windows NT Advanced Server version 3.1
- --------------------------------------------------------------------
-
- Files stored on a FAT file system take more disk space than on HPFS or
- NTFS file systems. This is because the FAT file system uses clusters
- to allocate disk space for files. Clusters represent the minimum
- amount of disk space any file can use. For example: If your cluster
- size is 4K and you create a 1 byte file, you will waste almost 4095
- bytes.
-
- If you are storing many large files on a FAT file system, the wasted
- space is minimal. But, if you have many small files, the wasted space
- can be equal to or greater than the amount of data you are storing.
-
- FAT cluster size is dependent on the size of the logical drive.
- Because the FAT file system can only track a maximum of 64K clusters,
- the larger the logical drive or partition, the larger the cluster
- size. Also, there is a maximum cluster size of 64K, making the largest
- logical drive size 4 gigabytes.
-
- HPFS and FAT both have a fixed sector size of 512 bytes. HPFS uses a
- cluster size of two sectors (1K). NTFS supports cluster sizes of 512,
- 1024, 2048, and 4096 bytes.
-
- NOTE: In some cases, files stored on an NTFS partition may be bigger
- than the same files stored on a FAT partition. This is because NTFS
- stores all files in the master file table in 2048 byte blocks. If a
- FAT partition is using 512 byte clusters, it will store a small file
- more efficiently than NTFS.
-
- Additional reference words: 3.10
- KBCategory:
- KBSubCategory: FILSYS
-
- =============================================================================
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- Copyright Microsoft Corporation 1993.