Syntax CD_HSG2RED (address)
Location SMSQ/E for QPC

There are two common formats used to address sectors on a CD directly. The standard format is REDBOOK format, which uses a time index to calculate the sector to address.

This time index is in the form $00MMSSFF where MM is the minute, SS the second and FF the frame.

There are 75 frames in one second.

The other format is HSG FORMAT where the sector is calculated by reference to the formula:


This function takes the address in HSG format and converts this to REDBOOK format.


CD_RED2HSG allows you to convert REDBOOK format addresses to HSG format.

CD_HOUR, CD_MINUTE and CD_SECOND allow you to find out the hours, minutes and seconds referred to by a REDBOOK address.