The NHD file format is a HD image format used in the T98-Next emulator. It consists of a simple 512-byte header, followed by the data in C/H/S format
The below comes from kobushi's post on the NFG.Forums
The header starts at the beginning of the file (Offset 0):
Offs Size ____ _____ 0x00 15-byte ASCIIz String - "T98HDDIMAGE.R0" with a null (0x00 terminator) 0x0F BYTE - Reserved (0x00) 0x10 256-byte ASCIIz String - Comment field, null terminated 0x110 DWORD - Header Size (512 by default) 0x114 DWORD - Number of Cylinders 0x118 WORD - Number of heads 0x11A WORD - Number of sectors 0x11C WORD - Sectors per track 0x11E WORD - Sector length in bytes 0x120 - 0x1FF BYTE - Null (0x00) padding/reserved
An example converted with FIVEC is shown below:
The data segment then follows the header, in standard ordering. Because only a single value is provided for each aspect of drive geometry, varying size sectors and missing sectors are not supported by this format.
Back to the main page