diff --git a/bochs/.bochsrc b/bochs/.bochsrc
index 0bcf15b5f..3d2f897ed 100644
--- a/bochs/.bochsrc
+++ b/bochs/.bochsrc
@@ -173,7 +173,7 @@ ata3: enabled=0, ioaddr1=0x168, ioaddr2=0x360, irq=9
 # This defines the type and characteristics of all attached ata devices:
 #   type=       type of attached device [disk|cdrom] 
 #   mode=       only valid for disks [flat|concat|external|dll|sparse|vmware3]
-#   mode=       only valid for disks [undoable|growing|volatile|z-undoable|z-volatile]
+#   mode=       only valid for disks [undoable|growing|volatile]
 #   path=       path of the image
 #   cylinders=  only valid for disks
 #   heads=      only valid for disks
@@ -182,7 +182,7 @@ ata3: enabled=0, ioaddr1=0x168, ioaddr2=0x360, irq=9
 #   biosdetect= type of biosdetection [none|auto], only for disks on ata0 [cmos]
 #   translation=type of transation of the bios, only for disks [none|lba|large|rechs|auto]
 #   model=      string returned by identify device command
-#   journal=    optional filename of the redolog for (z-)undoable and (z-)volatile disks
+#   journal=    optional filename of the redolog for undoable and volatile disks
 #   
 # Point this at a hard disk image file, cdrom iso file, or physical cdrom
 # device.  To create a hard disk image, try running bximage.  It will help you
diff --git a/bochs/CHANGES b/bochs/CHANGES
index 5c1d41ba4..3b48be51f 100644
--- a/bochs/CHANGES
+++ b/bochs/CHANGES
@@ -91,7 +91,7 @@ Patches applied:
 - I/O devices
   - harddisks 
     - per device selectable Harddisk modes :
-      - undoable, volatile, growing, z-undoable, z-volatile disks support
+      - undoable, volatile, growing disks support
       - sparse disks support (contributed by justinSB)
       - vmware3 disks support (contributed by Sharvil Nanavati)
     - fix non detection of hard drives by minix2
diff --git a/bochs/iodev/harddrv.cc b/bochs/iodev/harddrv.cc
index 1e15f5284..16cab8d2f 100644
--- a/bochs/iodev/harddrv.cc
+++ b/bochs/iodev/harddrv.cc
@@ -1,5 +1,5 @@
 /////////////////////////////////////////////////////////////////////////
-// $Id: harddrv.cc,v 1.111 2003-09-22 23:32:23 cbothamy Exp $
+// $Id: harddrv.cc,v 1.112 2003-10-29 01:12:07 cbothamy Exp $
 /////////////////////////////////////////////////////////////////////////
 //
 //  Copyright (C) 2002  MandrakeSoft S.A.
@@ -159,7 +159,7 @@ bx_hard_drive_c::init(void)
   Bit8u channel;
   char  string[5];
 
-  BX_DEBUG(("Init $Id: harddrv.cc,v 1.111 2003-09-22 23:32:23 cbothamy Exp $"));
+  BX_DEBUG(("Init $Id: harddrv.cc,v 1.112 2003-10-29 01:12:07 cbothamy Exp $"));
 
   for (channel=0; channel<BX_MAX_ATA_CHANNEL; channel++) {
     if (bx_options.ata[channel].Opresent->get() == 1) {
@@ -316,17 +316,23 @@ bx_hard_drive_c::init(void)
 
 #if BX_COMPRESSED_HD_SUPPORT
           case BX_ATA_MODE_Z_UNDOABLE:
+            BX_PANIC(("z-undoable disk support not implemented"));
+#if 0
             BX_INFO(("HD on ata%d-%d: '%s' 'z-undoable' mode ", channel, device, 
                                     bx_options.atadevice[channel][device].Opath->getptr ()));
             channels[channel].drives[device].hard_drive = new z_undoable_image_t(disk_size,
                             bx_options.atadevice[channel][device].Ojournal->getptr());
+#endif
             break;
 
           case BX_ATA_MODE_Z_VOLATILE:
+            BX_PANIC(("z-volatile disk support not implemented"));
+#if 0
             BX_INFO(("HD on ata%d-%d: '%s' 'z-volatile' mode ", channel, device, 
                                     bx_options.atadevice[channel][device].Opath->getptr ()));
             channels[channel].drives[device].hard_drive = new z_volatile_image_t(disk_size,
                             bx_options.atadevice[channel][device].Ojournal->getptr());
+#endif
             break;
 #endif //BX_COMPRESSED_HD_SUPPORT