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