Verbatim External Hard Drive User Manual download pdf (Page 5)

How it works

All hard disks use rotating platters

(disks) which spin at a constant RPM.

Each platter has a smooth magnetic

surface on which your digital data

is stored. Information is written to

the disk by applying a magnetic

ﬁ eld from a read-write head that

ﬂ ies very close over the magnetic

surface. The magnetic medium

(ﬁ lm) on the disk surface changes its

magnetization in microscopic spots

(bits) due to the head’s write ﬁ eld.

The information can be read back by

a magnetoresistive (MR) read sensor

which is part of the same head

structure on the trailing end of the

ﬂ ying slider. The read sensor detects

the magnetic ﬂ ux eminating from the

bit transitions passing underneath

it through a small change of the MR

sensor’s electric resistance.

Magnetized Data on Disk

Motion of Suspension and Head

Tracks

Head

Disk

Rotation

Disk

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