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What is the difference between an E-IDE hard drive and an internal SCSI hard drive?

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Enhanced IDE

Enhanced IDE is a standard electronic interface between your computer and its mass storage drives. EIDE's enhancements to Integrated Drive Electronics (IDE) make it possible to address a hard disk larger than 528 Mbytes. EIDE also provides faster access to the hard drive, support for Direct Memory Access (DMA), and support for additional drives, including CD-ROM and tape devices through the AT Attachment Packet Interface. When updating your computer with a larger hard drive (or other drives), an EIDE "controller" can be added to your computer in one of its card slot.

To access larger than 528 MB drives, EIDE (or the basic input/output system that comes with it) uses a 28-bit Logical Block Address (LBA) to specify the actual cylinder, head, and sector location of data on the disk. The 28 bits of the LBA provide enough information to specify unique sectors for a device up to 8.4 GB in size.

EIDE was adopted as a standard by ANSI in 1994. ANSI calls it Advanced Technology Attachment-2 (it's also referred to as "Fast ATA").

Internal SCSI :

A computer is full of busses -- highways that take information and power from one place to another. For example, when you plug an MP3 player or digital camera into your computer, you're probably using a universal serial bus (USB) port. Your USB port is good at carrying the data and electricity required for small electronic devices that do things like create and store pictures and music files. But that bus isn't big enough to support a whole computer, a server or lots of devices simultaneously.

Internal SCSI hard drive devices usually connect to a controller card.

It's a fast bus that can connect lots of devices to a computer at the same time, including hard drives, scanners, CD-ROM/RW drives, printers and tape drives. Other technologies, like serial-ATA (SATA), have largely replaced it in new systems, but SCSI is still in use.

SCSI has several benefits. It's fairly fast, up to 320 megabytes per second (MBps). It's been around for more than 20 years and it's been thoroughly tested, so it has a reputation for being reliable. Like Serial ATA and FireWire, it lets you put multiple items on one bus. SCSI also works with most computer systems.

However, SCSI also has some potential problems. It has limited system BIOS support, and it has to be configured for each computer. There's also no common SCSI software interface. Finally, all the different SCSI types have different speeds, bus widths and connectors, which can be confusing. When you know the meaning behind "Fast," "Ultra" and "Wide," though, it's pretty easy to understand.

SCSI is often used to control a redundant array of independent discs (RAID). Other technologies, like serial-ATA (SATA), can also be used for this purpose. Newer SATA drives tend to be faster and cheaper than SCSI drives.

If you need any help in maintaining your E-IDE hard drives or Internal SCSI hard drives, call us immediately. Our computer repair service team will be there to assist you.

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