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Newer Serial ATA (3Gbps SATA) interface disk drives may employ a technology called Spread Spectrum Clocking* (SSC) which helps to reduce electronic emissions (EMI) in large, multi-drive systems. Single drive environments may not need SSC to meet EMI requirements.
SSC, or spread-spectrum clocking, is a frequency-modulation technique used in the design of synchronous digital systems (a hard drive) to reduce the spectral density of electromagnetic interference (EMI) that hard drives generate. Because of its precise periodic nature, the system emits spectral energy that's concentrated in a vary narrow frequency and its harmonics. This creates emission-energy peaks that can interfere with the operation of neighboring electronics. SSC lowers peak spectral energy, thus EMI as well, by modulating the frequency of the clock signal by around .1-.5 percent.
The Intel® Entry Storage System SS4000-E does not support SSC.
The process to disable SSC on SATA hard drives varies between drive manufacturers. Some drive manufacturers have jumpers to enable/disable this setting. Some drive manufacturers utilize a software utility to enable/disable this setting.
Please refer to the hard drive manufacturer's documentation for details on disabling this feature on your SATA hard drives.
The SSCset* Toggle Utility from Seagate can disable or enable the SSC feature on Seagate* disk drives. The Seagate SSCset Toggle Utility can be downloaded from here:
Seagate*
This applies to:
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