From Syslinux Wiki

[edit] About

disk.c32 is a COM32 module for Syslinux that displays some info about all hard disks it can find.

To get a more detailed report of your hard disks, use the Disk section of HDT

[edit] Syntax

disk.c32

[edit] Example

boot: disk.c32                                                                  
DISK 0x80:                                                                      
  C/H/S: 255 heads, 1023 cylinders                                              
         63 sectors/track, 2 drives                                             
  EDD:   ebios=1, EDD version: 30                                               
         16 heads, 16383 cylinders                                              
         586072367 sectors, 512 bytes/sector, 63 sectors/track                  
         Host bus: PCI, Interface type: ATA                                     
                                                                                
DISK 0x81:                                                                      
  C/H/S: 16 heads, 247 cylinders                                                
         63 sectors/track, 2 drives                                             
  EDD:   ebios=1, EDD version: 30                                               
         16 heads, 248 cylinders                                                
         250368 sectors, 512 bytes/sector, 63 sectors/track                     
         Host bus: PCI, Interface type: ATA