Two reasons for installing another hard drive in an existing computer are: 1. To support RAID arrays; 2. To store system swap files. The hard drive is a major computer storage medium that can be used to increase storage space, increase hard drive speed, store system exchange files, improve fault tolerance, etc.
The operating environment of this tutorial: Windows 7 system, Dell G3 computer.
What are two reasons to install another hard drive inside an existing computer? (Choose two.)
A. Support RAID array
B. Storage BIOS configuration settings
C. Storage system swap file
D. Increase CPU speed
E. Allow access to secondary monitor output
Reference answer: A C
Explanation ：
Hard-Disk Drive, referred to as hard disk, is a major computer storage medium, consisting of one or more aluminum or glass discs. It is through the hard drive that the computer can store data.
Function of hard drive:
1. Increase storage space;
2.Increase hard drive speed;
3.Install another operating system;
4. Storage system swap files;
5. Improve fault tolerance;
6. Back up the original hard drive.
RAID array
RAID is the abbreviation of English Redundant Array of Independent Disks, and the Chinese abbreviation is independent redundant disk array. Simply put, RAID is a technology that combines multiple independent hard disks (physical hard disks) in different ways to form a hard disk group (logical hard disk), thereby providing higher storage performance and data backup than a single hard disk.
The different ways to form a disk array are called RAID Levels. From the user's perspective, the disk group looks like a hard disk, and the user can partition, format, etc. In short, the operation of the disk array is exactly the same as that of a single hard disk. The difference is that the storage speed of a disk array is much higher than that of a single hard disk, and it can provide automatic data backup. The function of data backup is to use the backup information to restore the damaged data once user data is damaged, thereby ensuring the security of user data.
There are three main benefits of using RAID technology in storage systems:
Provides disk spanning function by organizing multiple disks together as a logical volume;
Improve the speed of disk access by dividing data into multiple data blocks (Blocks) and writing/reading to multiple disks in parallel;
Provide fault tolerance through mirroring or verification operations;
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