A legacy device is an old device that is not normally used now, but someone may still have them for occasional use. Most data is now stored on disks, but rarely on tape. However some data is stored on tape and old tape readers can be used to read that. Those tape machines could be described as legacy devices.
Most biometric devices would be input devices although they may also utilize storage devices and output devices in their functioning. A biometric device usually takes in biometric information about a person and compares it to information stored in a database - much like username/password methods of authentication compare the username and password to the stored information for a user. Fingerprint scanners, read the fingerprint, convert it to a data stream and then compare it to the stored data previously recorded for the individual, retinal scanners read information about the retinal patterns of a user, convert it to data and compare it to stored data, etc. Note that biometric devices must rely on a storage device, but usually the storage device is not part of the biometric device. Instances of OUTPUT associated with a biometric device might be a signal to open a door or trigger an alarm, but again, the output usually comes from another device that the biometric device is connected to.
A keyboard.
Networking.
The hard drive is the main, and usually largest, data storage device in a computer. The operating system, software titles and most other files are stored in the hard drive.
Mouse
FAT
Most biometric devices would be input devices although they may also utilize storage devices and output devices in their functioning. A biometric device usually takes in biometric information about a person and compares it to information stored in a database - much like username/password methods of authentication compare the username and password to the stored information for a user. Fingerprint scanners, read the fingerprint, convert it to a data stream and then compare it to the stored data previously recorded for the individual, retinal scanners read information about the retinal patterns of a user, convert it to data and compare it to stored data, etc. Note that biometric devices must rely on a storage device, but usually the storage device is not part of the biometric device. Instances of OUTPUT associated with a biometric device might be a signal to open a door or trigger an alarm, but again, the output usually comes from another device that the biometric device is connected to.
Static electricity can affect your PC by erasing/corrupting your stored data. The most common way of damaging a USB storage device is through common static electricity.
The hard drive is the main, and usually largest, data storage device in a computer. The operating system, software titles and most other files are stored in the hard drive.
Actually there are several options and strategies in order to prevent data loss on a PC. One could for example store the personal / important data on a RAID 1 storage medium which actually mirrors the data. Another option would be to do regular backup stored on an external device of the most important data.
A Memex is a device that one would store music, book and have a variety of other options such as a camera. The device is the same concept as the iPod that most people have today.