M40S 24
SAMSUNG HARD DISK DRIVE
Attachment 1. The basic information related HDD
※The basic information of HDD
1) The logical elements constituted hard disk
①Track: The data inputted by computer was written at tracks on disk. The tracks, in spite of
invisible,are the concentric circles from the center of disk to the outside.
The tracks are divided into spaces regularly. The number of tracks is different according to
the size and capacity of disk.
②Sector: Data are recorded in track on disk, it means data is written on tracks which is
divided into sector on disk. The data is written on tracks which is divided into sector on disk.
A sector is a piece of pizza,naming track.
③Side: Disk has two sides like a coin has the front and the back side.
The front side of disk is side 0, the back is called side 1.
④Cylinder: The definition of cylinder is added the meaning of track and side.
A track 1 on side 1 is different from a track 1 on side 2. But cylinder 0 means the both
of tracks in side o and 1. That is cylinder 0 means all number 0 of tracks on both sides.
⑤Cluster: Disk has physical mechanism that constituted track (divided by the location of
read/write head ) and sector (divided by track). It's a fact that there is a real logical
factor, that is cluster, make the data can read/write.
One cluster consists of two sectors usually. The capacity is 2 Kbyte commonly in hard disk.
But we are cautious that no matter what the data is so small,use one independent cluster.
For example, a cluster occupy 1 Kbyte can't written any other files.
The rest of cluster are useless. If we have 1,025 Kbyte file, we need two cluster to written.
If the size of cluster is getting bigger, the efficiency of disk is lower but the speed of
that is faster than.
※refer to picture - Track,Sector,Side
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