Scalp sensitivity has several origins. It could be caused by an imbalance in the sebum secretion process, which leads to irritation. Pollution and stress can also irritate the scalp. In fact, pollution coats the hair in harmful elements that create a dull film over the hair and, like stress, generate free radicals.
Hard drive sizes. Hard drives come in two basic physical sizes: 2.5-inch and 3.5-inch. These sizes refer to the size of the data platters, not the size of the hard drive mechanism. Traditionally, 2.5-inch drives are used for laptops while 3.5-inch drives are used for desktop computers. Some compact desktops also use the smaller drives to enable a smaller form factor for the computer.
Windows, however, sticks to the 1024 rule, which means it sees a 250GB hard drive as 232GB, and a 1TB drive as 931GB. This explains why hard drives appear to have a lower capacity than advertised. A 1TB hard drive has the capacity to store 1,000,000,000,000 bytes.