For women giving birth for the first time, the mucus plug is usually expelled days before labour begins and may often be a sign of early labour. Generally, it is never reason to worry regardless of whether the mucus plug is released early or late.
Hard drive. A hard disk drive (sometimes abbreviated as Hard drive, HD, or HDD) is a device used to permanently store and also retrieve information. There are many variations, but their sizes are generally 3.5 and 2.5 for desktop and laptop computers respectively.
The Hard Drive on your computer is where all your files are stored. Not only that, it's the place where the Operating System itself is installed. A hard drive is a physical thing inside of your computer. If you were to take it apart, you'd see one of more disks (called platters), one on top of the other. In a modern hard drive, however, there's usually just one platter. The disks are magnetised and can be written to and read from.