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  • 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 canattain one of two values: 0 or 1. Its symbol issmall „b“. For example: 1b, 128kb. Bits are usually used when describing theInternet connection speed. The speed indicatedis 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 prefixkilo/mega/giga – For example 1 B, 64 MB, 2GB. 1 byte = 8 bits. In IT bytes are used more often thanbits. Bytes – or its multiples are used to describesize which data occupy in a computer. For example1 MB (1 megabyte is about 1000000 bytes) is thesize of one photo or about 50 pages of text. Usually kilo means thousand, mega one million andgiga is billion. With computers this is not exactly likethat. To approximate, one KB is 1000B but exactnumbers 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 labeledby 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 dataand 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).