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What's the conversion between Advertising HD size and Actual HD size? My 130gb is seen in windows as a 121gb HD, and a PC I'm working on is listed as a 160gb but is being seen as a 149gb (is that right?).

Hard drive manufactures define sizes this way:
1 KB = 1000 bytes
1 MB = 1KBx1KB = 1000x1000 = 1,000,000 bytes
1 GB = 1KB x 1MB = 1,000,000,000 bytesWindows defines sizes this Way:
1 KB = 1024 bytes
1 MB = 1KBx1KB = 1024x1024 = 1,048,576 bytes
1 GB = 1KB x 1MB = 1,073,741,824 bytesTo convert from a 160GB hard drive to what Windows reports:
160 GB = 160,000,000,000 / 1,073,741,824 = 149.012 GB

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