Integrated File System Introduction

 

*TYPE1 and *TYPE2 stream files

A file has one of two format options: *TYPE1 stream file or *TYPE2 stream file.

A *TYPE1 stream file has the same format as stream files created on releases prior to version 4, release 4 of OS/400. It is saved faster than a *TYPE2 stream file to releases prior to version 4 release 4 of OS/400. It has a minimum size of 4096 bytes.

A *TYPE2 stream file has high performance file access and was new in version 4 release 4 of OS/400. It is saved slower than a *TYPE1 stream file to releases prior to version 4 release 4 of OS/400. It has a minimum object size of 4096 bytes. All files created with V4R4 and newer systems are *TYPE2 stream files.

Though *TYPE2 stream files work only with V4R4 and newer systems, you can save a *TYPE2 stream file for restoration on a pre-V4R4 system. However, this process may be slow.

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