很正常，读Fine Print

This MB is not that MB.

512MB = 512,000,000 Bytes (MB = million bytes)

1 KB = 2^10 = 1024 bytes
1 MB = 2^10 * 1KB = 1048576 bytes

512,000,000 / 1048576 = 488.28125MB (MB = mega bytes)

所有跟帖： 

• 格式化后的容量488M，少的部分被系统用来存放 -M6502- ♀ (18 bytes) () 08/04/2004 postreply 07:47:46

• what?! Memory for FAT? -ppzcgg- ♀ (18 bytes) () 08/04/2004 postreply 11:27:27

• forget it, misread -ppzcgg- ♀ (0 bytes) () 08/04/2004 postreply 11:31:14