## Physical Device Driver Reference

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### CDROMDISK_GETVOLUMESIZE (78h) - Return Volume Size

Category:
IOCTL_CDROMDISK (80h)
Function:
CDROMDISK_GETVOLUMESIZE (78h)
Description:
Return Volume Size

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    Description
    Parameter Packet Format
    Data Packet Format
    Returns
    Remarks

This function returns the total number of accessible sectors on the disc. The value returned is the same as that returned in the extended BIOS parameter block by DSK_GETDEVICEPARAMS. This function is performed regardless of whether the drive is already playing.