Since the beginning of the personal computer (PC) people need external memory. The following materials discuss top of the external memory (disks) to existing technologies. was in the beginning of the PC, the floppy disk drive that only 5 1 / 4 were "wide. The operating system and applications need is to be loaded into the floppy drive just to run the computer in the early 1980s. computer's hard drive allows applications to be loadedthe computer without a floppy drive. During this time, people could store information on these disks and keep in line and then uploaded the new computer.
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The original 5 4.1 "floppy disk instead of 160 KB (kilobytes) of data, but soon 360KB improved. In this perspective, the share is 1KB about half a page of text. Disk drives on a vinyl record that has already been done tracks, where the data was stored. 5 1 / 4 "crowned at 1.2MB(Megabytes), but remained fragile in the disk that came sensitive to environmental contamination. The following format was a 3 1 / 2 "floppies. These were not only smaller, but they had a plastic container to protect them. Even though they hold only 720 KB of data begins, were soon able 1.44 MB Data hold and have been much easier if not in the cases and off-site. Towards the end of 1980, 5 1 / 4 size "floppy disk drive 3 1 / 2 have been replaced."
External Hard Drive
During the same period in 1980the internal hard drive has become a standard for the PC as well. There are clear differences between the hard disk space (think library of information) and memory (RAM - Random Access Memory) and the floppy drive (used to get information). The drive began in the fifth quarter in size 5 MB "store (megabytes) of data is steadily increasing in 1980 to drive in Quantum 1.28GB. To put this in perspective, 1 GB 250 MP3 songs. Unlike the disc,Hard drives have been installed inside the computer. Hard drives continue to make progress in shrinking its form factor 3 1 / 2 "in 1990. These units are called half-height drives. In 1990, the discs have been growing by about 40 gigabytes (GB) total memory to all of today's 3 TB (terabyte) drive.
Hard drives continue to shrink with laptop models standardize on 2 1 / 2 "form factor. Hard disk in an external housing, whileto engineer for some time, always in the consumer market in standard formats such as USB (Universal Serial Bus) has been, FireWire and SATA (Serial AT Attachment), although the 2000's. This new format allows the case to be fairly portable interface standard (eg, USB) you can connect to another system painless. USB provides a generic Plug and Play enables the system to identify the unit as soon as you link here. There are someHomes on the market to maintain the unity and even provide RAID (Redundant Array of Inexpensive Disks) functions. RAID allows you to speculate or your data from one hard disk to another or spread (stripe) the data on the drives you have. This provides a fail-safe in case of loss from a disk failure of the computer will not notice any difference with your login information to take as the other disks.
Even though hard drives have beenstandardized form factor (full height or half board), diversifies the floppy drive to a full range of products including USB drives today. End of 1980 came a new format called CD (Compact Disk), the stored data offered on a plastic disc with a reflective support. These CD drives were 5 1 / 4 "form factor fits easily into existing cracks and expansion into the PC. CD store 680MB of data on the participation of about 74 minutes of music and have exceeded the 700 MB of data began. CD,standard format for removable media, and are still widely used today. In the early 1990s, the market came with the Iomega Zip drive. This external storage device, 100MB and 750MB began grew to density. E 'was still based cartridge, the 3 1 / 2 "floppy innovation. This new type of storage had several connections to the PC.
In principle the connection SCSI (Small Computer System Interface) was developed later, but in a (Universal Serial Bus) USB port. With1995 smart media had arrived at the scene of Toshiba Corporation. SmartMedia is a small (45mm) plastic card with a memory card 2 MB of internal flash can store in a hurry, but this 64MB/128MB. These cards are used in digital cameras and other devices can read and exchange that runs on your PC. Today you can find in various sizes up to 32 GB on a single card. Unlike older technologies, these new devices are far more powerful than the floppy driveand more portable. At the same time, the DVD (Digital Video Disk) are in the market to replace the CD. This format provided 4.7 (8.5g dual-layer) of space on the same optical disc format that was based on the CD. With increasing density Blu-ray DVD came to 50 GB of storage space with dual-layer discs are the most common. Blu-Ray offers the best of high density video format available in stores now with 100GB of data standards.
FlashForward to today as portable hard drives and external storage media must SSD (Solid State Disk) technology forward. This transforms the portable storage solution enables you to those ubiquitous USB drives make fun of people. Hard Disk SSD technology can be used to connect the internal SATA drive to your PC or laptop. SATA is the common standard for connecting hard drives. These units are more durable and have less access time. Newly emerging technologiescomes as cloud computing will be less need for portable data storage and hard drives. Cloud computing allows you to see the application running, while the data is located elsewhere (the cloud). Make no mistake the data is stored, just not on your hard disk or floppy disk.
A brief history of external storage devices - from disc to disc
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