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The sector size for each file type is shown in Table 4.1.

Table 4.1 Sector length for each file type 
 File type 
 Sector length (byte) 
CD-ROM mode1
2048
 CD-ROM mode2 form1 only 
 2048 
 CD-ROM mode2 form2 only 
 2324 
 CD-ROM mode2 mixed 
 undefined 
 DOS file 
 2048 
 Memory file 
 2048

∙ Reading is performed in units of sectors, while reading is performed in units of 4 bytes.

4.3 Parameters managed for each file

Of the parameters managed by the library for each opened file, the application can change five parameters. These parameters are shown in Table 4.2.

Table 4.2 Parameters for each file 
 Parameter 
 Description 
 Function to change 
 Default 
 Access pointer 
 Start reading 
 Off 
 set on file (unit is sector) 
GFS_Seek
0
 Eject mode 
 After ejecting, 
 Delete or leave the CD 
 buffer sector data 
 Specify whether to keep 
GFS_SetGmode
GFS_GMODE_ERASE
 Transfer mode 
 Specify the device to perform 
 extraction processing 
 GFS_SetTmode 
GFS_TMODE_CPU
 Reading parameter 
 Read once 
 Transfer in processing 
 Maximum number of sectors 
GFS_SetReadPara
GFS_RPARA_DFL
 Extraction parameter 
 Extract once 
 Number of sectors to transfer in processing 
GFS_SetTransPara
1

∙ Open files occupy one aperture and one buffer partition, which are CD block resources.

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