What is the form of data entered in disc and after deleting what happening for the data?

We are saving , editing, and deleting data s in a memory.We can open it and edit or play.I f not necessary we can delete it.What is the form of data stored and what happens after deletingWhat is the form of data entered in disc and after deleting what happening for the data?
When you say memory there are 2 types - volatile and non-volatile. Volatile memory is dependent on electricity flowing to its system in order to actively store, read and write from that memory. When there is no electricity, volatile memory is flashed or wiped clean. You can never recover data from this type of memory (i.e. RAM or cache).



Non-volatile memory, like a hard drive is design to store data even when no electricity is flowing to it. When this type of system is active or accessible, you and read and write (edit) and delete. When you delete something in this type of system you are really just telling that portion of the memory is now available to be written with some other data, but it is not really "deleted". The reason it does not get wiped clean, is because that takes time to do... so why waste the time. Instead, you just tell it through a grid like system (imagine an excel spreadhseet) that certain areas are available for writing to. If you delete something in a particular location and the system has never written over that location with new data, then "theoretically" it can be recoverd. I say theoretically, because most systems to not have a direct why of recovering that data through any pre-defined process, but many systems have the ability to flag that area and wait to use it until absolutely necessary (old DOS allowed attributes of this on specific files and then once deleted you could then use an "undelete" command to bring them back). This latter method is still a little "costly" from a computing perspective, so you don't do it by default.This is why, for example if a persons who has committed a crime for instance has their computer confiscated that the authorities could essentially pull pieces of data that the person believed they deleted, because it may not have been over written and you could use technology to pull all the data (not just the active data) from the system - you would however have to do a lot of work in analyzing the data to understand what format it is in, where one set of data starts and another begins.



Hope that helped.What is the form of data entered in disc and after deleting what happening for the data?
Saved in binary form? Just a long amount of 1's and 0's that specify the character's and stuff used and when deleted, that code is just deleted into OBLIVION D:What is the form of data entered in disc and after deleting what happening for the data?
ooops ! you are almost there ! the sleuths.



data remains ther even if you delete .. only file manager is wiped out. so, disk shows free space and new data is overwritten but not mixed up due to new file manager. all this till formatting.