All hard disk storage uses magnetically coated platters spun at high RPM between sensitive read/write heads. Data is then moved to and from the hard disk to a host computer across a standard interface (e.g., ATA, SCSI, SATA or SAS). But to overcome their limitations in performance and reliability, disks are often combined into RAID groups. Storage arrays group together dozens (sometimes hundreds) of disks together to provide terabytes of storage. This guide explains hard disk mechanisms, RAID groups and storage arrays.
A storage array provides an independent, standalone platform where disk arrays can be gathered into extremely large groups -- sometimes hundreds of disks. This chapter of our Disk Storage All-In-One Guide looks at the wide range of disk array types, along with product and buyer's advice.
This is the first segment of our Guide to Disk Storage. Here, we explore the various disk drives available. When the next chapter launches, we'll look at RAID. The final chapter takes a deeper look at disk arrays.
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This chapter in our Disk Storage guide looks specifically at RAID, including overview information, explanations of RAID levels, how to implement and configure RAID, and other higher level information.