Frequently Asked Questions
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Q: What is the difference between 68-pin and 80-pin SCSI drives and what kind does my server support?

A: Current SCSI hard disk drives typically come in either 68-pin or 80-pin varieties. NSCA (non-SCA) drives use a 68-pin connector for data and a separate 4-pin Molex style power connector. SCA (Single Connector Attachment) hard drives use a single 80-pin connector. 68 pins on the SCA connector are used for data and the other 12 pins are used to provide power to the hard drive. SCA hard drives are hot-swappable.

Server Model 68-pin SCSI 80-pin SCSI (SCA-2) Add-in SCSI Card Required
to USE SCSI Hard Drives
6400 X    
7000/7000R X X**  
7200 X X**  
7210/7210R X X  
7250R X* X  
7300 X X**  
7400R X X  
7450R X* X  
8000 X X  
8200/8200R X X  
8300 X X  
8400/8400R X X  
8450R X X  
9000/9000R X X  
9200/9200R X X  
9250R X X**  
840      
850   X  
860      
910     X
920     X
930/930R X X  
935 X* X  
955 X* X  
960 X X  
975 X* X  
980 X X  
995   X  

* Although the 68-pin SCSI interface existed on the server, there were no extra drive bays incorporated in this chassis to accommodate any additional 68-pin devices.

** SCA (hot-swappable) drive cage was optional upon purchase.