NEMA PS 1 : 1991

Foreword
Scope
1. REFERENCED STANDARDS AND DEFINITIONS
     Referenced Standards
     Definitions
2. PHYSICAL AND LOGICAL DESCRIPTION OF TAPE
     Physical Characteristics
       Media Definition
       Recording Density and Encoding Method
       Block Size
       Tape Length
     Logical Requirements
       Introduction
       Tape Layout
       Tape Markers and Labels
         BOT
         VOl1
         UVL1
         UVL2
         UVL3-9
         UVL2 Gap
         HDR1 and EOF1
         Tape Mark
         EOT
     Files
       Introduction
       Directory
         Filler Files
         Directory Gap
         Mandatory Directory
         HDR1 file identifier for the mandatory directory
         Directory Map
         Data Set IDs (1-N)
         EOF1 of Directory File
         Optional Directories
       Data Set
TABLES
2.1 Read-Write Compatibility of Levels
2.2 Elements in the User Volume Label 1 (UVL1)
2.3 Elements in the User Volume Label 2 (UVL1)
2.4 Directory Map Example
FIGURES
2.1 Data Set File Structure
2.2 ACR-NEMA Tape Standard, Level 1
2.3 ACR-NEMA Tape Standard, Level 2
2.4 ACR-NEMA Tape Standard, Level 3
2.5 CR-NEMA Tape Standard, Level 4
2.6 Corrupt Block Following Expansion of the Directory
      (ACR-NEMA Level 3)

Defines the physical and logical requirements for magnetic tape media for use in an interchange environment.