My HP3906 how hard it is the ultra-150G depressed WHY

storage devices such depressed Oh no, not depressed, normal people like to eat, you eat to Cheng Si? You can not.Therefore, the hard disk is the same, it needs to own a little bit of space to stay ah, under normal circumstances, less than the original hard drive 2-3G is normal!!! Ha ha does not affect the other will be able to function, not depressed!!! ! Actually available to the general store is less than the nominal capacity, this is a normal phenomenon, such as Seagate 320G hard disk, the actual capacity is generally available in about 300G, if you press the depressing not to die? Normal general The hard disk factory capacity for 1000 is based on the calculation of the band (which is 1,000 bytes for the 1kb, 1000kb to 1MB).In the Windows system is formatted according to an M-ary 1024 for the calculation, 160G format after only 149G about normal.