Zusammenfassung der Ressource
1.3 storage
- primary storage refers to the memory areas that the cpu can access very quickly.
- cpu registers, cache, ROM,RAM
- primary storage has the fastest read/write speed and is mostly volatile
- secondary storage is non- volatile
- its where all data (operating system applications and user files are stored when not in use.
- it includes magnetic hard disk drives, solid state drives.
- CD,SD cards
- Read/write speeds are much slower compared to primary storage
- Hard disk drives are the traditional internal storage in PCs and laptops.
- a hard disk is made up of a stack og magnetised metal disks spinning at a rate of between 5400 and 15000rpm(reveloutions per minute)
- Data is stored magnetically in small areas called sectors within circular tracks.
- portable HDDs are popular for backing up and transporting large amounts of data
- Despite their moving parts , HDDs are generally very long lasting and reliable.although they could be damaged by large impacts like being dropped.
- solid state drive (SSDs) are storage devices with no moving parts.
- most of them use a type of flash memory
- SSDs are used for the same purpose as HDDs- for internal storage.
- SSDs have signficantly faster read/write than HDDs. using a SSD rather than traditional HDD can give quicker times for booting up.
- optical discs are things like CD, DVDS and Blu-ray
- CDs can hold around 700MB of data. DVDs can hold around 4.7GB
- magnetic tape has much greater storage capacity than HDDs.