Optiarc 7190s

i got a sony optiarc 7190s sata drive …flashed it to LiteOn DH20A3.
works decent.

cant get drive letter assigned using a win98 startup disk.
is there a DOS driver or boot disk for SATA rom drives?

cant burn to a 2x cdrw media
like to use these rewriteables for firmwares etc but no worky forme.
had to put my old LieOn CDRW drive back in for that.

thanks for any help with those.