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09-18-2006, 08:16 AM
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#2 (permalink) |
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banned
Join Date: Apr 2006
Posts: 21,091
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Any SCSI drive is one that requires an expansion card unless a board already has one onboard. That would rather rare at this point since boards now see SATA or SATA/RAID as the onboard controller. SCSI drives have always had the reputation for fast access when storing data and files on them.
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09-18-2006, 06:33 PM
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#3 (permalink) |
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banned
Join Date: Aug 2006
Posts: 4,711
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As usual he didn't answer the question.
To answer it specifically, here is a good article that oulines everything about SCSI, including the several different types of SCSI ultra. http://en.wikipedia.org/wiki/Scsi |
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09-19-2006, 12:36 AM
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#4 (permalink) | |
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banned
Join Date: Apr 2006
Posts: 21,091
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Quote:
Ultra SCSI SCSI Terms & Terminology Ultra SCSI Data transfers 20 megabytes per second, first defined in Fast-20, below defines how it is used in the different generations of the SCSI standards The different entries in the table are for the number of devices supported with the cable length. SCSI Fast-20 (SCSI Parallel Interface) 8 bit SCSI asynchronous commands with Synchronous data transfer rates up to 20 megabytes per second. CMOS technology with active negation single ended bus transceivers, active termination, and Differential (Now called HVD – High Voltage differential) bus transceivers based on EIA 485 allowed in SCSI Fast-20. SCSI SPI-2 (SCSI Parallel Interface) 8 bit SCSI asynchronous commands with Synchronous data transfer rates up to 20 megabytes per second. CMOS technology with active negation single ended bus transceivers, active termination, LVD (Low Voltage Differential) and Differential (HVD – High Voltage differential) bus transceivers based on EIA 485 allowed in SCSI SPI-2. http://www.scsita.org/terms/Ultra_SCSI.html |
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09-19-2006, 05:03 AM
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#6 (permalink) |
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VIP Member
 
Join Date: Apr 2006
Location: Kansas City, MO
Posts: 9,933
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SCSI (small computer systems interface) is an I/O interface for storage devices and peripherals. Mainly HDs. However, you can also use SCSI for optical drives (including tape), and scanners (they don't make scsi scanners anymore AFAIK).
A SCSI controller as mentioned previously is needed to run these devices. The controller is what makes the SCSI drive superior to things like PATA, and even SATA. The controlers themselves can have processors and RAM on them, allowing the systems CPU(s) to free up any cycles maintaining and using the drives. The controllers also directly control the devices so they run in more optimal states. That is why SCSI is really only found in server side solutions these days. However, even a few of our servers at my work have SATA RAID in them, SCSI is still the way to go. For example, we have many of the HP Proliant 380 G4 servers at my work. They run RAID 5 with SCSI drives, because its faster and more reliable. To an end user, a SATA drive will suffice since they would not utilize the need to have something like an Ultra320 SCSI drive in their system. Just like most end users won't benefit from running a RAID 0 in their system. It is also expensive, which is why SATA is more practical for the end user. I can only assume you want to play games, surf the net, and maybe burn some music or movies with your computer. For this a SATA drive is all you need. |
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