It seems previous post about possible Yamaha 8424s "DAO RAW" in next version of firmware didn't confirmed!..Ian from Yamaha CDR-W Info site sent :

"..From: Craig Campbell
To:
Sent: Monday, November 29, 1999 9:23 PM
Subject: Re: CRW8424 and RAW mode new firmware

Sorry, no. Only the older Yamaha CDR100 & CDR102 models supported this format. No other model Yamaha recorder will support the RAW write at this time.

Regards,
Craig Campbel
Yamaha Systems Technology, Inc.."