active storage capacity
有效存储容量
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Thus a 5, 400 RPM HDD can use the flash memory for speeding performance while providing as much as 30% higher storage capacity for a given number of active disk surfaces than a 7, 200 RPM drive.
FORBES: Seagate Discontinuing 7,200 RPM Drives--A Focus on Capacity?
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