Storage

Storage

1. File Compression

   • Suitable for backups because of the fact that it allows more free space for more files as if the documents are compressed the file sizes are smaller.
   • Compression is used over the web in order to send quicker and more effectively. It can then be uncompressed after.
   • File extensions for compression is TIFF for scanning photos, JPEG for all files and MPEG for videos

2. Image compression

   • Image compression results in pixelation due to resolution being decreased.
   • Image compression is suitable when images are smaller due to the fact pixelation won't be as notcieable.
   • Jobs like photographers need high quality images because if the images are pixelated it will be lower quality and difficult to see what they're trying to show.
   • Images on the internet are compressed so that the iages dont take up too much space on things such as search engines. All high resolution = Crash

3. Internal and external storage

   • ROM (Read only memory) is the main memory that holds computer programmes and data while the computer starts up.
   • BIOS is input and output software that allows tasks to be carried out.
   • RAM (Remote access memory) is where data is read and written at the same time. Stored onto the main device and can be accessed pending requirements.
   • Storage Items: USB memory device, hard disk drive, Bios chip, RAM, DAT tape, SSD card
   • Storage device is a piece of physical equipment that saves data whereas the medium does the transfer of data.

4. Raid/ Mirroring and hotswapping

   • RAID (Redundant array of inexpensive disks) is a set of hard disks used to stop data loss.
   • Hotswapping is where a drive is shut down without shutting down the server so that time isn't lost to the organisation
   • Mirroring is used to make sure there are more than one copy of data available so that if an accident occurs then data may be lost from one drive but not all.
   • when a hard drive is fragmented there isn't enough storage to group the information, meaning that speed of access to the hard drive will be reduced.

5. DAT tape- Removable storage

   • DAT tape is a removable storage medium
   • DAT tapes are useful for servers as they are easy to transfer.
   • DAT tapes are slow to retreive data from as it is physical tape which means they have to reel through in order to find the information.
   • DAT tape is sequential is you have to go through all of the recording in order to find the data.

6. Optical Storage

   • There was a need for 25gb data because there was demand for more data to be held
   • Read only means the content can't even be modified only viewed.
   • ROM is read only memory which means that no adjustments can be made and data can only be transferred.
   • R allows the user to make amendments once so that data is up to date or more reliable.
   • RW means that the viewer can modify it endlessly due to the fact it is open for the user.

7. Flash Memory

   • Devices such as cameras, mp3 and mobile phones use flash memory
   • SSD (Storage state drive) is becoming more popular because they are stored on microchips so impossible to corrupt.
   • A hybrid drive is parts of IT organisations and is a blend of (SSD) and (SSHD)

8. Cloud Storage

   • Cloud storage is the method of saving information online on an account so it can be accessed anywhere
   • Online storage has only just taken off as an idea
   • Cloud storage is a model of data storage where digital data is stored online and the physical storage is based around the world.
   • People dont like it as much because it's difficult to back up