Solid state hybrid drives another new storage option

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Systems Architecture
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Chapter 14 / Exercise 3
Systems Architecture
Burd
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SSD of 128 GB or 256 GB and then a mechanical hard drive, or two, to provide TBs of inexpensive slower storage space.Solid State Hybrid DrivesAnother new storage option is the solid state hybrid drive (SSHD). An SSHD drive is a combination of both amechanical hard drive and an SSD into a single device (see Figure 6.15). SSHD drives offer a very small amount of SSDstorage space, perhaps 8 GB. If it is enough to store the operating system however, it can have a huge impact on thesystem boot time.Optical DrivesHow do optical drives work? Optical drivesare disc drives that use a laser to store and read data. Data is saved to acompact disc (CD), digital video disc (DVD), or Blu-ray disc (BD) (collectively called optical media) within establishedtracks and sectors, just like on a hard drive. But optical discs store data as tiny pits that are burned into the disc by ahighspeed laser. These pits are extremely small, less than 1 micron (a millionth of a meter).Data is read from a disc by a laser beam, with the pits and nonpits (called lands) translating into the 1s and 0s of the
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Systems Architecture
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Chapter 14 / Exercise 3
Systems Architecture
Burd
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2017-10-11, 1(06 PMTechnology in Action CompletePage 24 of 62blob:binary code that computers understand. CDs and DVDs use a red laser to read and write data. Blu-ray discs get theirname because they are read with a blue laser light, which has a shorter wavelength and can focus more tightly and packmore information on a disc. Blu-ray drives are the fastest optical devices and deliver the high-definition quality video thatlarger displays and monitors demand.FIGURE 6.15 The SSHD drive is a single unit that contains both an SSD and a mechanical harddrive.(Zern Liew/Shutterstock)Should I bother having an optical disc drive?Traditionally, optical media delivered music and movies, but these arenow available through streaming services. Likewise, in the past, software was often installed from a DVD, but now youcan buy almost all software through an online download. Therefore, many lightweight systems have stopped includingoptical drives. For example, ultrabooks are so thin and lightweight they often leave out an optical drive but may include aslot for an SD memory card to allow you to transfer files. You can buy external optical drives, but if you have a need foroptical drives, you’re probably better off purchasing a laptop computer with an optical drive.
2017-10-11, 1(06 PMTechnology in Action CompletePage 25 of 62blob:235SOUND BYTEOptical Media Reading and Writing InteractiveIn this Sound Byte, you’ll learn about the process of storing and retrieving data from CD-RW, DVD, and Blu-raydiscs.DIG DEEPER How Hard Drives WorkThe thin metal platters that make up a mechanical hard drive are covered with a special magnetic coating that enablesthe data to be recorded onto one or both sides of the platter. Hard drive manufacturers prepare the disks to hold datathrough a process called low-level formatting. In this process, concentric circles, each called a track, and pie-shapedwedges, each called a sector

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