发明名称 |
Method and apparatus for identifying spindle imbalance in a hard disk drive |
摘要 |
A method and apparatus are provided for identifying spindle imbalance in a hard disk drive. Position error signal (PES) samples are received from a plurality of sectors of a predefined cylinder for a plurality of disk surfaces. The PES samples are measured and stored for a defined number of revolutions for each of the plurality of disk surfaces. For each of the plurality of disk surfaces, a repeatable runout (RRO) of the PES is computed for the defined number of revolutions. A first harmonic discrete Fourier transform (DFT) and a first harmonic phase of the RRO are computed. Then a mean repeatable runout (MRRO) is computed. A first harmonic DFT and a first harmonic overall phase of the MRRO are computed. For each of the plurality of disk surfaces, cross-correlation coefficients are computed and summed to identify a spindle imbalance factor. The identified spindle imbalance factor is compared with a predefined threshold value to identify spindle imbalance in the hard disk drive. An available controller in the disk drive can perform the method to identify spindle imbalance. In a Redundant Arrays of Inexpensive Disks (RAID) system, the RAID controller performs the method to identify spindle imbalance.
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申请公布号 |
US2003030936(A1) |
申请公布日期 |
2003.02.13 |
申请号 |
US20010854637 |
申请日期 |
2001.05.14 |
申请人 |
INTERNATIONAL BUSINESS MACHINES CORPORATION |
发明人 |
SMITH GORDON JAMES;OTTESEN HAL HJALMAR |
分类号 |
G11B5/596;(IPC1-7):G11B5/596 |
主分类号 |
G11B5/596 |
代理机构 |
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