What is the difference between LC and LW in SCSI drives

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What is the difference between LC and LW in SCSI drives

Postposted on Sat Feb 01, 2003 9:12 pm

What is the difference between LC and LW in SCSI drives?
for instance the ST318432LW and the ST318432LC. Thanks
ssj3alan
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Postposted on Sat Feb 01, 2003 10:28 pm

LC = 80pin
LW = 68pin
RandomNull
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Postposted on Sat Feb 01, 2003 10:50 pm

80-pin is used for hot-swap drives in server cases.
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Postposted on Sun Feb 02, 2003 1:08 am

Is there any performance difference in 80 pin compared to 68 pin or are those 12 extra pins just there for stability when hot swapping drives?
ssj3alan
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Postposted on Sun Feb 02, 2003 1:45 am

The extra pins are for power and assigning the SCSI ID. If you got one for use outside a hot swap drive bay, you'd have to get an 80-68 pin converter which would also have the power connector and SCSI ID jumpers.
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Postposted on Sun Feb 02, 2003 3:04 am

ssj3alan wrote:Is there any performance difference in 80 pin compared to 68 pin or are those 12 extra pins just there for stability when hot swapping drives?


No, there is no performance difference. The interface is the same. U160 80pin and U160 68 pin are the same thing, different connector.

80 pin is called "SCA" which stands for single connector (or contact, or connection) attachment. It is designed for simplicity for hotswap in servers, but there is nothing wrong with using it in a workstation with a 68 pin to 80 pin adapter.
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Postposted on Sun Feb 02, 2003 2:33 pm

Except I've only had about a 25% success rate with various 68-pin to 80-pin adapters. They just don't work very well for some reason.

I've had much better success just buying hot-swap cages for my 80-pin drive and truly making them hot-swap. But this is additional cost on top of the drive.

There is no performance difference, as others have said. Simply the ability to hot-swap, assign SCSI IDs externally, and run power through the same connector as the signal lines.
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