how does storing in a PC drive works? what happen when we delete? where does the deleted file go?

Answer 1

HDDs record data by magnetizing a magnetic material in a pattern that represents the data. They read the data back by detecting the magnetization of the material. A typical HDD design consists of a spindle which holds one or more flat circular disks called platters, onto which the data is recorded. The platters are made from a non-magnetic material, usually glass or aluminum, and are coated with a thin layer of magnetic material.

The platters are spun at very high speeds. Information is written to a platter as it rotates past mechanisms called read-and-write heads that operate very close over the magnetic surface. The read-and-write head is used to detect and modify the magnetization of the material immediately under it. The magnetic surface of each platter is divided into many small sub-micrometer-sized magnetic regions, each of which is used to encode a single binary unit of information. In today's HDDs each of these magnetic regions is composed of a few hundred magnetic grains. Each magnetic region forms a magnetic dipole which generates a highly localized magnetic field nearby. The write head magnetizes a magnetic region by generating a strong local magnetic field nearby.Storage on a hard drive is separated into blocks and sectors. When you add data, it is written to the next available block and sector, provided it fits. The exact storage block and sector for the different pieces of the data is stored on the hard drive are kept in the File Allocation table. This is like a huge card index in a library and it tracks each bit of data. The most common implementations have a serious drawback in that when files are deleted and new files written to the media, directory fragments tend to become scattered over the entire media, making reading and writing a slow process. Defragmentation is one solution to this, but is often a lengthy process in itself and has to be performed regularly to keep the FAT file system clean. When a file is deleted it usually is erased from the File Allocation table only. The data remains on the drive but is tagged to be overwritten by the next data insertion. This is why files that are accidentally deleted can often be recovered and so it is important not to write any data to a drive if files are accidentally deleted. I hope this helps.

Answer 2

Data is physically written to sectors and tracks with a directory area that acts as a index to the data. When you delete the data, only the directory area is really updated. So, the data is pretty much still there, but it is marked as free space so that another file can be written to that sector and track. You must physically overwrite that location (lots of freeware available to do this) if you wish that information to be truly gone.

Answer 3

when you delete somthing it is really still there The computer just designates the area on the hard drive as free and the info you deleted will remain there until the computer writes over it