USB flash drive and all types of Flash Cards (SmartMedia =SM card, Compact Flash = CF card, MultiMediaCard = MMC card, Secure Digital = SD card, Memory Stick) have long been used on a large scale and widely available, but they have some other applications besides being storage devices. For example: As a boot disk for Windows PE OS, as a system installation disk, as a replacement for various Live CDs, and so forth. Today we are going to talk about using USB flash drive (Flash Card needs to cooperate with the card reader to work the same way) as a key for locking/unlocking your computer with ease.

ZEDGE (AKA: ZEDGE Ringtones & Wallpapers) is a very popular and long-standing mobile phone personalized customization app with a history of more than 10 years of update and development, and ever won the 2015 Google Play Store Best Apps award. It allows user to online download and share (i.e. upload) free, high-quality and original wallpapers (including dynamic ones), beautiful backgrounds, lock screens, original icons pack, pleasant ring tones, message notification sounds, and more for your Android- or iOS-based mobile devices.