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peripherals:disk [2019/08/11 14:53]
scott created
peripherals:disk [2019/08/11 14:58] (current)
scott
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 Disk devices have 100-byte sectors.    All disk devices attached to a host are treated as a single pool of blocks by the MCP; with the pool of blocks divided into allocation pools.   The subsystem number associated with each [[ssog1:commands:dsk|disk]] determines which allocation pool a device is part of.   Applications can specify which allocation pool is used for the areas of a disk file through source language specific mechanisms. Disk devices have 100-byte sectors.    All disk devices attached to a host are treated as a single pool of blocks by the MCP; with the pool of blocks divided into allocation pools.   The subsystem number associated with each [[ssog1:commands:dsk|disk]] determines which allocation pool a device is part of.   Applications can specify which allocation pool is used for the areas of a disk file through source language specific mechanisms.
 +
 +The following filenames are reserved to the MCP.
 +
 +The following file identifiers are reserved for use by the MCP and cannot be used for user-created disk files.
 +
 +^  Reserved File Identifiers  ^  Reason  ^
 +| ADFL*W  | AD rule overflow file (* is a [[mcp:system_number|system number]] and may range from zero to three)  |
 +| CONFG*  | System Configuration File (* is a [[mcp:system_number|system number]] and may range from zero to three)  |
 +| CTLDCK  | [[ssog3:utilities:ldcntl|LDCNTL]] card deck  |
 +| DSKAVL  | [[peripherals:disk|Disk]] available table (tracks free space on disk)  |
 +| DSKDIR  | [[peripherals:disk|Disk]] directory  |
 +| hlparm  | Persistent [[mcp:halt_load|Halt/Load]] parameters  |
 +| MCPMCP  | MCP Disk-resident Codefile.   Loaded by [[ssog3:utilities:system|LOAD MCP]] console command.  |
 +| mstavl  | Master Available tables.  |
 +| nLOG*w  | MCP logs (system and option dependent).  //n// denotes the name of the log file and can be **M**, **R** or **S**.\\ //*// is a system number and may range from zero to three.\\ //w// denotes a rotating log file number and can be zero through nine or **X** with zero indicating the active log file and **X** a reserved log file  |
 +| PCRXRF  | [[mcp:pcr|Pseudo Reader]] dictionary  |
 +| pntp*t  | Program Name Table (* is a [[mcp:system_number|system_number]] and may range from zero to three)  |
 +| SQARCY  | [[ssog1:commands:sq|SQUASH]] recovery file  |
 +| USERFL  | System Access Control file  |
 +| USRCOM  | System Access Control file  |
 +
peripherals/disk.txt ยท Last modified: 2019/08/11 14:58 by scott
 
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