Typically it is referred to as Primary Storage. However, the method of technology to do this varies.
Many media currently called 'Secondary' was not always so, and may not always be so in the future. For example, Floppy Drives and CDs/DVDs. There exist systems which lack a Hard Drive, and use these exclusively.
In some terminologies, Primary Storage may refer to as RAM (Random Access Memory).
It depends greatly, and there are no official requirement.
Here's a breakdown of memory types:
Volatile (Erased when power lose): Buffers, RAM (DRAM of all kinds)
Non-Volatile: Hard Drives, Solid State Drives, SD cards, USB Memory Sticks, Compact Flash Cards, Tape Drives, Floppy Drives, Drum Drives, Magneto Optical Disks, CDs, DVDs, Blu-Ray, HD-DVDs, HVDs, Laserdiscs, Punch Cards, Tape Reels, IBM Racetrack Memory,
Semi-Volatile: RAMDrives, Jump Drives, Capacitor Sheets, Cache (SRAM), Racetrack Memory, Bubble Memory, Mercuric Resonance Memory, Vacuum Tubes, Selectron Tubes, Firmware, EEPROM, CMOS
portable storage medium
No, it is a removable storage medium that may be used by a computer.
CDRW and DVDRW
Transfer rate.
Optical Storage Medium
If you are asking what the largest storage component in a personal computer is, that would be the hard drive. The hard drive is a non volatile storage medium. Meaning it holds its data, even when the power is turned off.
No. It transfers it from memory to a storage device, so it does the opposite.
The main storage medium within the system unit is the hard drive or solid-state drive (SSD). This is where data is stored persistently, even when the computer is turned off.
A storage tape is a high quality medium (often 8mm wide now) in a cartridge used to store backups of computer system files.
Defrag, chkdsk, are the two big ones.
RAM
Auxiliary storage devices are used to provide additional, portable storage, as opposed to hard drives which are fixed inside the computer and serve as primary storage devices. ------------------------------------------------------------------------------------------------------------------ Auxiliary storage is a term used in mainframe computing and refers to the medium on which paging datasets reside.