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A magnetic head in the drive changes the polarity to write data to it.
21. Optical disc – CD, DVD
Stores data in patterns of greater and lesser reflectivity on the shiny surface of the disc
23. A laser changes the surface reflectivity in certain spots to write the data– hard disk, floppy disk
Stores data in patterns of positive and negative magnetic polarity in metallic particles on the surface of disk platters.
A magnetic head in the drive changes the polarity to write data to it.
26. Optical disc – CD, DVD
Stores data in patterns of greater and lesser reflectivity on the shiny surface of the disc
A laser changes the surface reflectivity in certain spots to write the data
Disk types such as CDs, DVDs, and floppy disks are removable from the drive.
For these disk types, the disk and drive are separate.
A hard disk drive is different. It combines a hard disk and a hard drive. No hard disk is separate from the hard drive.
Flash RAM is static (nonvolatile) memory, retaining its content even when it is unpowered.
USB flash drive plugs directly into a USB port
Flash card reader reads flash RAM data from a card
Solid state drives (SSD) replace mechanical hard disk drives in some systems
36. Windows assigns drive letters automatically:
A and B. Floppy drives, if present.
C. Primary hard disk drive.
D through Z. Other drives.
The disk icon reflects the drive type. A generic name or custom volume label also identifies the disk.
Computers store data in binary format—a collection of 1s and 0s.
Each individual 0 or 1 is a bit.
Each group of eight bits is a byte, or a single character of information.
The capacity of a disk, size of a file, or amount of memory are all expressed in bytes.
45. Kilobyte (KB) = 1,024 bytes. 210 bytes.
46. Megabyte (MB) = 1,048,576 bytes. A kilobyte of kilobytes.
47. Gigabyte (GB) = 1,073,741,824 bytes. A kilobyte of megabytes.
48. Terabyte (TB) = 1,099,511,627,776 bytes. A kilobyte of gigabytes.
Right-click a drive icon and then click Properties to see its exact amount of total space used and remaining capacity.
Plug a USB flash drive into a USB port, or insert other flash media into a slot on your PC on AutoPlay window appears to ask what to do with the newly detected storage.
In most cases, the correct choice is Open folder to view files a card reader.
Flash drives, being removable, are useful for moving files from one PC to another.
You can open separate Computer windows for the source folder and flash drive and drag and drop selected files or folders between them.
54. You also can copy (Ctrl+C) and paste (Ctrl+V) files or folders. Or, right-click the selection, click Send To, and click the name of the flash drive.
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