Polarizing
True.
Magnetic Disks, otherwise known as 'Floppy disks'. The last generation of these disks were 3 1/2" and used a ridgid plastic case, to contain the magnetic disk within. Not very floppy. The early versions were 7" and 5" and were contained in soft plastic outer sleeves. These were actually floppy.
true
The process that converts binary information into patterns of magnetic flux on a hard disk's surface is called magnetic recording. This involves encoding binary data (0s and 1s) into magnetic fields, which are created by the read/write head of the hard drive. The head alters the magnetic orientation of tiny regions on the disk's surface, representing the stored data as changes in magnetic flux. When data is read, the changes in magnetic orientation are detected and translated back into binary information.
No. A CD is a type of optical media. An example of magnetic media would be tape (eg. VHS and cassette)
The surface charge density on the disks is the amount of electric charge per unit area on the surface of the disks.
Head – The device that reads and writes the information—magnetic or optical—on the disk surface.
Audio
read/write head
Some examples of dynamic units are magnetic disks, magnetic drums, and magnetic tapes
Magnetic
Hard-disks are coated with iron oxide because it reacts to a magnetic source ! The information on a hard-disk is read and written by a magnetic 'head' which scans across the surface as the disk rotates.