DC7800 Driver boot floppy PC-DOS

[Georges44]

I try to make a boot floppy (PC-DOS) for DC7800 machine. The same disk works on various machines, but on DC7800 it does not discover the DVD/CD Drive wich is identified as "TSSTcorp CD DVDW TS-H653Q" in hardware management vista.
I get a message "no drive found" while boot and no CD is identified
Is that a special driver ?
Below, config.sys and autoexec.bat
=====================================
COUNTRY=041,850,\COUNTRY.SYS
DEVICE = oakcdrom.sys /D:cd1
DEVICE = btdosm.sys
DEVICE = flashpt.sys
DEVICE = btcdrom.sys /D:cd2
DEVICE = aspi2dos.sys
DEVICE = aspi8dos.sys
DEVICE = aspi4dos.sys
DEVICE = aspi8u2.sys
DEVICE = inicd.sys /D:cd3
DEVICE=\DISPLAY.SYS CON=(,,1)
LASTDRIVE = Z
=====================================
@echo off
MODE.COM CON CP PREP=((850) \EGA.CPI)
MODE.COM CON CP SEL=850
KEYB.COM sf,,\KEYBOARD.SYS /ID:150
SET TZ=GHO-01:00
MOUSE.COM
CLS
LH \MSCDEX.EXE /D:cd1 /D:cd2 /D:cd3

[PhilipHarvey]

I have the same problem with DC7900 computers. We use Ghost to deploy images to our computers, but this requires the DOS CD driver to be working. So far I tried the open source GCDROM as well and this also can not detect the TS-H653Q
The TS-H653Q must be a new drive since our older DC7800 computers are all working OK

[PhilipHarvey]

I tried setting the SATA emulation to IDE, which is the default on our old DC7800 computers, and this worked.
Perhaps a new version of the BIOS firmware has changed the default setting for this.