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.
You may be using a 2.5-inch drive, but usually 3.5-inch drives. Typically, [theyâll be 7,200 rpm] devices -- domestic drives, if you like. [What you normally put in a laptop] is a smaller disk, usually 2.5-inch, and so obviously a different form factor. Now, solid-state disks come in both form factors, so clearly you have to choose the form factor that suits you, and weâre starting to see a lot of 2.5-inch form-factor SSDs coming out.