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    Flash Drive

                     The Flash Drive is a small portable data storage device integrated with a Universal
                     Serial Bus (USB) connector.

                     Pen Drive

                     A Pen Drive acts as a portable hard drive and is easy to use as it is
                     small and can be carried in a pocket and plugged into any computer
                     with a USB port. A pen drive has a storage capacity of up to 1 TB.

                             The USB flash drive is based on flash memory, which was created in the
                             early 1980s by Fujio Masuoka.

                     Memory Card

                     A Memory Card is commonly known as a multimedia memory
                     card. It is very small in size, usually 1–1.5 inches. These are
                     used in mobile phones and digital cameras. You need to have a
                     card reader to read the stored data on the memory card.

                     Measuring the Computer’s Memory

                     The basic unit for measuring the memory of a computer is the byte. A byte consists
                     of a group of eight bits, for example, 10001011, that is, 1 byte equals 8 bits. A group
                     of 4 bits is known as a nibble (half a byte), for example, 1001, that is, 1 nibble equals
                     4 bits. Other units for measuring the computer’s memory are Kilobyte, Megabyte,

                     Gigabyte, Terabyte, and so on.

                                   8 bits       1 Byte                         1024 Bytes          1 Kilobyte (KB)

                        1024 Megabytes          1 Gigabyte (GB)             1024 Kilobytes         1 Megabyte (MB)

                         1024 Gigabytes         1 Terabyte (TB)            1024 Terabytes          1 Petabyte (PB)

                          1024 Exabytes         1 Zettabyte (ZB)           1024 Petabytes          1 Exabyte (EB)

                         1024 Zettabytes         1 Yottabyte (YB)         1024 Yottabytes          1 Brontobyte

                                                    1024 Brontobytes           1 Geopbyte

                                                                                       Data Storage and Memory     11

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