[Info-vax] danger from HVD SCSI

[Richard B. Gilbert]

On 11/3/2010 4:15 AM, Michael Kraemer wrote:
> Dennis Boone schrieb:
>> > I've been told that the "easily understood international icon" for
>> > HVD is different than the one(s) used for LVD or SE, but if it's true
>> > I can't remember which is which.
>>
>> And to aggravate the sin of deliberately being a Dennis responding to
>> a post by another Dennis, I'll follow up to my own post. Shoot me.
>>
>> Thought to jfgi _after_ hitting send. This page, and the one it links
>> to as "Next: Low voltage..." at the bottom, have the icons.
>>
>> http://www.pcguide.com/ref/hdd/if/scsi/protDiff-c.html
>>
>> De
>
> And if you look at the icons, it's (at least for me)
> very easy to mistake one for the other.
> I mean, who can remember whether that extra angle for HVD
> is within the diamond symbol or outside of it?
> Moreover, it doesn't seem mandatory to display these symbols
> on the SCSI devices. With the exception of some IBM parts
> I have a pile of disks where only googling or guessing
> would tell whether they are HVD or LVD/SE.
> Even worse, the vendors didn't seem to care to clearly
> identify their HVD host adapters.
>

What's in it for them???

Every time a customer screws up they sell replacement hardware.  I 
recall being handed a DLT tape drive and being told to connect it to the 
SCSI bus.  Which I did.  As I recall, we smoked both the drive and the 
controller.  Somebody had ordered the right kind of drives which was 
some single ended/LVD and some HVD.  This information was not shared 
with the front line troops with the predictable results.