diff --git a/kernel/drive.asm b/kernel/drive.asm
index 243b8e0..31efa81 100644
--- a/kernel/drive.asm
+++ b/kernel/drive.asm
@@ -1,11 +1,15 @@
 ; drive table
-%define drivetab_type    0x00 ; BYTE 0=unassigned, 1=BIOS/CHS, 2=BIOS/LBA
-%define drivetab_num     0x01 ; BYTE DL number
-%define drivetab_heads   0x02 ; CHS heads
-%define drivetab_spt     0x03 ; CHS sectors per track
-%define drivetab_sectors 0x04 ; total number of sectors
-%define drivetab_offset  0x08 ; partition offset
-%define drivetab_size    0x0C
+%define drivetab_type    0x00 ; BYTE  0=unassigned, 1=BIOS/CHS, 2=BIOS/LBA
+%define drivetab_num     0x01 ; BYTE  DL number
+
+; CHS data for type=1
+; Might be reused for driver address
+%define drivetab_heads   0x02 ; WORD  CHS heads
+%define drivetab_spt     0x04 ; WORD  CHS sectors per track
+
+%define drivetab_sectors 0x06 ; DWORD total number of sectors
+%define drivetab_offset  0x0A ; DWORD partition offset
+%define drivetab_size    0x0E
 
 drive_table:
   dw 0