Low Voltage Disk
hehehe
and this comment :
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Also note that there is a BIG difference between the standard 68pin and the 68pin LVD. You can't mix and match. So if your drive is LVD then you a> need to make sure your card has a LVD channel on it, and b> need to make sure you hook up to that channel.
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is wrong.
You CAN mix and match LVD and SE devices. (SE = Single ended, and is what that "standard 68 pin" is refering to). WHen you put a SE device on a LVD channel everything falls back to the speed of the SE device ( normally 20 or 40 depending on the technlogy).
Differential (or as some geeks call it HVD now) was a much higher voltage adn THAT you cant mix and match. if you put a SE device on a Differential channel you could burn out the SCSI logic chip on the SE device rather fast, if not instantly.
SCA2 is what you would be looking for SCA is an older standard. I would recomend avoiding SCA/2 drives since they add another level of complication for problems. If you can get a normal 68 pin version you would be better off in the long run. ( unless you have back plane you plan on mounting the drive to.)
Last night I just took a 12 disk 9.1GB UW SCSI RAID array out of commission... replaced it with a handful of 100 and 120GB IDE drives... the funny thing is that the IDE is faster than the UW SCSI was for transfer even on a massive array like that. THe array was split on 2 channels on a Mylex DAC960 series RAID card with 64mb cache. I still run all U160 SCSI in my main workstation though, never ditching SCSI from that box.
Also SCSI ONLY reaches its potential with a handful of drives or more. a Single SCSI drive on a U320 will really perform marginal if at all faster than a high end IDE drive on a SATA setup. But in a cluster of SCSI drives, in a array config, you can get some seriously high output and fill the U320 up in no time. keep that in mind when you are buying or building a SCSI setup... its power in numbers that makes the difference.
(this is coming from a person who owned SCSI drives in every workstation I ever owned since I was 10 years old. My first IDE drive was a 20GB WD I bougth about 3 years ago. Took that long for IDE to impress me
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