Bits are the basic units of information that can have a value of 0 or 1. Bytes are made up of 8 bits and are commonly used to describe the size of digital files and storage capacities. Common units are kilobytes (KB), megabytes (MB), and gigabytes (GB). Data can be stored internally on a computer's hard disk drive or externally on removable media like CDs, DVDs, flash drives, and external hard drives. Online storage services allow users to back up and access their files from any internet-connected device.

1. UNITS OF INFORMATION AND DATA STORING
(REVIEW OF IT BASICS)
ITC s.r.o.
Přemysl Morgan Vacek

2. UNITS OF INFORMATION
 BIT
 Bit is a basic unit of information. One bit can
attain one of two values: 0 or 1. Its symbol is
small „b“. For example: 1b, 128kb.
 Bits are usually used when describing the
Internet connection speed. The speed indicated
is in kb, Mb (kilobits, megabits) per second
(kbps, Mbps or kb / s, Mb / s).

3. UNITS OF INFORMATION
 BYTE (BAJT)
 Its symbol is big „B“, usually with prefix
kilo/mega/giga – For example 1 B, 64 MB, 2GB.
 1 byte = 8 bits. In IT bytes are used more often than
bits. Bytes – or its multiples are used to describe
size which data occupy in a computer. For example
1 MB (1 megabyte is about 1000000 bytes) is the
size of one photo or about 50 pages of text.
 Usually kilo means thousand, mega one million and
giga is billion. With computers this is not exactly like
that. To approximate, one KB is 1000B but exact
numbers are like this: 1 KB is 210 byte, which means,
that 1 KB = 1024 B.

4. STORING DATA IN PC
 INTERNAL MEMORY
 HDD – Hard Disk Drive. In operating system (OS) is labeled
by alphabetic character (for example „C:“)
 INTERCHANGABLE MEMORY
 CD / DVD / Blu-ray disks.
 Flash disks (USB dongles)
 External hard disk drives
 ONLINE STORAGE
 A place on the Internet, where we can upload our digital data
and access them from any computer all over the world.
 Backup / synchronization purposes
 Dropbox (www.dropbox.com)
 Google Drive (drive.google.com)
 SkyDrive (skydrive.live.com)
 CrashPlan (www.crashplan.com).