dection 5Storage Devices.docx

The power connector is unplugged the sata cable is

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The power connector is unplugged. The SATA cable is unplugged. The drive is malfunctioning. Drive noise HDD Excessive or unusual drive noise is almost always indicative of a failing hard disk. For example, a clicking noise coming from the drive usually indicates one or more failing heads. SSD Storage Issues 0:00-0:30 Implementing an SSD storage device in a desktop or notebook computer can significantly increasethe overall performance of the system.
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However, the same flash memory technology that makes SSDs so much faster than standard hard disk drives also introduces other maintenance and troubleshooting issues that you need to be aware of as a PC technician. In this lesson, we will review several of these issues and what you can do to keep SSD drives runningproperly. Most file systems used by PC operating systems, such as NTFS, do not store files contiguously on storage devices. Defragmentation Issues 0:31-2:03 Instead, to use storage space more effectively, the file system divides files up into chunks and stores them in free locations wherever they can be found on the drive. This process is called fragmentation. Fragmentation on SSD storage devices is less of an issue than on hard disk drives. File systems such as NTFS still fragment files when writing them to the drive to optimize storage space. But SSD storage devices don't have read/write heads. Therefore, no repositioning must occur to read a heavily fragmented file. The SSD drive doesn't care where the fragments are stored in its memory chips. A fragmented file can be read as quickly as a contiguous file. Therefore, when working with SSD drives, you don't actually need to defragment them, as you do standard hard disk drives. In fact, it's actually bad if you do defragment SSDs. This is because SSDs wear out over time. Each cell in a flash memory bank has a finite lifetime. It can only be written to and erased a certain number of times before it fails. Running defragmentation utilities cause many write/erase operations to occur. While this doesn't affect standard hard disk drives, it quickly uses up the flash memory's finite lifetime. Therefore, you should use security and maintenance and control panel to disable automatic disk defragmentation on Windows systems using SSD storage. SSD Lifetime 2:04-2:51 In fact, this is one of the key maintenance issues you need to be aware of when using SSDs in a computer system. Some PC applications tend to overuse storage devices. For example, audio, graphic, and especially video editing applications commonly require a very large number of write/erase operations to do their work. As a result, they can cause SSD storage devices to fail prematurely. However, these applications also benefit greatly from the increased speed offered by SSD storage devices. Therefore, if you choose to use SSDs with these types of applications, you should consider configuring an automatic data back-up process, such as Backup and Restore or File History to regularly back up the data stored on the SSD drive on a traditional hard disk drive.
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  • Spring '14
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