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.
Usually, when you want to connect an external hard drive to your computer, you just plug it in and that's it. However, if you are using a Macbook Pro or any Mac computer, the hard drive must be pre-formatted as MAC OS Extended/ FAT32.If the hard drive is pre-formatted as NTFS, like most hard drives in the market, the Mac OS X can only read data from it, not write any data on it.Ad.hoose the format of the hard drive. Select Mac OS Extended (Journaled) if you only intend to use the hard drive for a MAC. 1  If you intend to use the hard drive to a PC as well, select MS-DOS File System. 2  If you choose this, you can only transfer files no larger than 4GB.