the another name for primary storage is main storage device.
It's a storage that is attached internally in the device's box.
Primary and Secondary storage.
hard disk drives
RAM is a primary storage medium, but it is volatile. Cache memories storage frequently accessible data.
To back up data, transfer media, install applacations, store files with out storge devices your coumputer is useless
primary storage
Yes both are secondary storage devices. Primary storage devices include RAM & ROM. Secondary storage devices include magnetic disks like hard disks and cds(optical disks)
locking abilty
both are the storage devices both store the data in binary form both are the costlier
RAM CACHE REgisters of processors
In most cases same type of devices used for primary storage - hard drives.