ITteoric9.pdf

Week 9: Storage, Secondary, Optical The optical disks feature with a spiral track, microscopic pits and bumps that disk drives read as binary data. While running in an optical disk drive, disks rotate at a constant speed. An optical lens over the surface of the disk to read this binary data, and sen...

Week 9: Storage, Secondary, Optical The optical disks feature with a spiral track, microscopic pits and bumps that disk drives read as binary data. While running in an optical disk drive, disks rotate at a constant speed. An optical lens over the surface of the disk to read this binary data, and sends it to the computer or laptop being used. Types: CD (Compact Disk) DVD (Digital Video Disk) BluRay 1 Storage, Secondary, Optical, CD CDs typically contain audio and other small amounts of data. Storage capacity is limited to 700 MB, so they’re not suitable for high definition video storage. Luckily, CDs cost very little money and take up very little space. They’re prone to scratches that render the disk unreadable, which leads to reliability problems. 2 Storage, Secondary, Optical, DVD DVDs look like CDs because they’re identical in size. All DVDs feature a spiral track with more data capacity than a CD. a finer laser to read data due to the higher density. Dual layering is a process with DVDs that further increases storage capacity. The average DVD features 4.7 GB of read/write data today. 3 Storage, Secondary, Optical, BluRay BluRay disks feature layering technology to increase capacity with more specialized violet laser. Storage capacity anywhere from 25 GB to 128 GB. BluRay disks cost more than CDs and DVDs but should be considered the gold standard of optical media.BluRay disk drives don’t come standard on all computers, but they’re quite affordable to buy and install. 4 Storage, Secondary, Online Also called Cloud Storage relies upon data stored on servers accessible at all times over the Internet. Data might be stored on multiple servers to ensure 100% uptime and reliability. Companies like Amazon, Google, and others offer cloud storage solutions. However, costs more money based on overall data storage needs. Unavailable internet connections render cloud storage useless, and the overall security of such storage is sometimes questionable. 5 Primary & Secondary Primary Storage Secondary Storage Examples: Hard Disk Drive (HDD), Solid Stade Examples: RAM, ROM, Cache, Buffers Drive (SSD), CD-Rom, DVD, Blu-Ray disks etc. Long term storage to hold data and programs Main memory in computers used to hold data that might not be used currently but they can be that is currently in use. used in the future. Provides the fastest data access in computers. Not as fast as Primary Storage. Located on the motherboard or on the CPU. Located on separate hardware storage devices. Data is usually lost (except ROM) when power Data is not lost when power is off. is off. Limited storage size. Larger storage size. Example Primary Storage Size (e.g RAM): Example Secondary Storage Size: 512GB to 4GB to 128GB 1TB Performance is effected only reading/writing Effects performance directly data into files 6