Having once worked for a major PC company, I can tell you first hand that some disk drives can make a compliant Class B PC fail the Class B limits when the drive is installed. I even saw one drive make the PC fail the Class A limits! The purchase specification must specify that a Class B PC and the drive must comply with Class B limits. Also, you should qualify the drive by performing emissions testing of the PC. Otherwise, you can get caught with your pants down.
Richard Woods ---------- From: Steve Chin To: [email protected] Subject: Re: Certified Devices List-Post: [email protected] Date: Monday, April 21, 1997 5:13AM Chris, none of the hard drive manufacturers certify that their mechanisms are Class B compliant. Just like a motherboard or power supply, the hard drive is considered a component. My company produces a wide variety of storage peripherals, and most of the drive manufacturers in the past have pretty much left companies like mine in the lurch where EMC compliance is concerned. They have been getting better (from a customer standpoint) at this lately, so most of what you'll find out there now will pass the Class B limits with some margin, provided you have a good host to start with, good power supplies, and reasonable filtering/shielding. None of the views expressed in this message intentionally represent those of any being, living, dead, or corporate. They are mine and mine alone. Steve Chin Compliance Engineer StreamLogic Corp. Menlo Park, CA, USA [email protected] Chris Herkey ([email protected]) wrote: >Does anyone know where a list of hard drives that are certified class B and >CE might be found? Or perhaps someone knows of a manufacturer? > >I need singled-ended and differential SCSI drives... > >Thank you, > >Chris Herkey >
