Seagate SV35 Beat the Heat: Designing SDVR Systems for Optimal Thermal Perform - Page 1
Seagate SV35 - Series 500 GB Hard Drive Manual
UPC - 000068216948
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TP552 • From: Global Product Marketing • May 2006 Technology Paper Beat the Heat: Designing SDVR Systems for Optimal Thermal Performance Introduction While the popularity of digital video surveillance systems continues to soar (J.P. Freeman Co. estimates worldwide annual growth at approximately 42 percent), there have been challenges along the way. Surveillance digital video recording (SDVR) system reliability has proven challenging for some, particularly in terms of the hard disc drive (HDD). This is primarily due to the harsh environmental and operational factors (poor ventilation, 24x7 write workloads) typical of SDVR disc drive applications. Fortunately, following a few simple guidelines for optimal SDVR system design and deployment will substantially enhance drive reliability. The single greatest threat to disc drive longevity is heat. Not only is heat a leading cause of outright component failure, it can also degrade system performance and stability. To understand why heat management is so critical to disc drive reliability, it's useful to briefly review the fundamentals of drive operation. Disc Drive Basics HDD storage relies on magnetism to store and retrieve data on the drive's platter(s). Tiny independent magnetic cells in the platter's coating are magnetically reoriented into a specific pattern by the drive's read/write head to write data, and those cells' magnetic orientation can be subsequently detected by that same head to read back that data. This arrangement is made possible by the extraordinary proximity of the read/write head to the platter surface. Riding a scant few nanometers above the rapidly spinning platter (see Figure 1), the complex read/write head system has been likened to a Boeing 747 flying at 600 miles per hour-six inches off the ground. The strength of any object's magnetic field rapidly falls off as distance from it increases; this principle applies 0.07 µm Flying Height 0.5 µm Spittle Mark 4.0 µm Finger Print Smudge 6.0 µm Smoke Particle 10.0 µm Dust Particle Figure 1: HDD flying height compared to common environmental contaminants