dection 5Storage Devices.docx

Some of the advantages of optical discs are they are

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sends laser optics to the disk, and receives the stored information through the deflected output. Some of the advantages of optical discs are: They are great for music and video (they play in audio or video devices that aren't computers). They are portable and universal. They are cheap. You can buy discs that are recordable. They have a long shelf life and are relatively sturdy. Blu-ray discs can store a large amount of data (25 GB or more, depending upon the format). Some of the disadvantages of optical discs are: They are slower than hard disks. They have a small capacity (650 MB for CDs, 4.7 GB for DVDs). There are some compatibility issues between disc formats and readers. Tape drive Tape drives (also called digital linear tape or DLT drives) store data on magnetic tapes. Tape drives are most commonly used for data backups, such as taking a backup of all hard drives in a system. Some advantages of tape drives: Tapes can typically store large amounts of data. DLT tapes range in capacity from 10 GB to 800 GB per tape. Tapes can be changed, allowing you to save data from different sources on the same drive. Tapes are relatively inexpensive and small enough for long-term storage. Some disadvantages of tape drives: Access to data on tape is typically slower than reading or writing to other storage types, making them not well suited for instant, interactive access. Data must be read from tape sequentially. The tape must be cued to the exact location on tape when data must be retrieved. The term removable storage refers to the ability to easily connect and disconnect storage devices or storage media from a computer (as compared to internal or fixed storage). Optical discs, flash devices, eSATA drives, and tapes are examples of removable media. Hard disks and solid state drives are typically not removable media as they are installed internally in the computer. SATA 0:00-2:37 In this lesson, we're going to talk about SATA storage devices. SATA stands for serial advanced technology attachment. It's also sometimes called serial ATA. We just call it SATA. The SATA storage interface uses a single cable to create a point-to-point connection between the storage controller and the storage device. There are a variety of different storage devices that can be used with the SATA interface, such hard disk drives, SSD drives, and optical disks. SATA uses a serial bus architecture,which is quite a departure from earlier storage interfaces. The SATA bus is composed of two different channels. One channel is used to transmit data, the other channel is used for acknowledgements. Within each channel is a transmit wire and a receive wire. Of course there are also several other grounding wireswithin the cable too. SATA cables can be up to one meter in length. One of the main design advantages of SATA is the fact that these thin serial cables facilitate better air flow throughout the computer case. Because they're small they don't restrict the air nearly as much and this allows you to have smaller PC cases. The SATA connector itself is only 7/8ths of an inch wide and it has only 15 pins in a single row. Notice that the connector has an L shape to it.
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