This BlogSpot, I'll publish some IT related software, news or experience. Any comments or suggestions are accepted. Feel free to look around! ^^

01 February, 2008

How to recover deleted files?

First, check the recycle bin. See if the thing's still there. If the thing's in recycle bin, thank god, you can recover it for good.

If it isn't, you can have another shot by trying this:


There're some chances that you can get back your old files.
The probability of getting your deleted files back depends on the time you delete the file, the file size, and your harddisc size.

The chances are high when:
- The file was just deleted recently
- The file size is small
- Your harddisc has a large free space

The chances are low when:
- The file was deleted long time ago
- The file size is big(you may not fully recover the whole file)
- You harddisc has minimum free space
- You do disc defragment very regularly(!!!)

I won't explain how to use this software in details. To learn how to use, surf their official website.

Some advise before you download and install the Undelete Plus.
1) Download and save the installer in a saperate drive other than the file you wanna recover. For example, you wanna recover the files on your drive C, download and save the installer into drive D. You can install it into a USB pendrive or external harddisc too.
2) The same goes to installing the software. Install it into a saperate drive. Install it into a USB pendrive or external harddisc if possible.
3) Once you found your files in the list inside the Undelete Plus, undelete and store the undeleted file into saperate drive as well.

Official Website
Download Link: here
Note: Undelete Plus isn't a freeware, it is offering free download now for a limited time. I'm not sure when will this offer ends. So if you wanna get it, get it now before the offer ends.

Read on for some computer knowledge...

How is deleted data recovered?
When you delete a file, the data isn't physically deleted from your harddisc. Instead, it is 'marked' as free space, and will not be listed when you view the folders. The Undelete Plus will scan the whole harddisc and list down all free spaces that contained data in it. When you undelete a file, it isn't 'switched' back from a free space to a file, but it's copied out. That's why the software does not recommend you to undelete the file onto the same drive, as it may overwrite another deleted data. If you wanna know why are some data not recoverable, read on...

How is data stored in your harddisc?
First, let me explain some key concepts of how data is stored. As you may know already, data is commonly measured in bytes. In fact, one byte is equals to 8 bits, where each bit represents a zero or one. So, data are actually made out of 0 and 1s. The harddisc stores data in one rule: data is stored on the first available space.

Let me explain in a more simple way.

Imagine that your harddisc is composed of 100 million small squares, each square represents one kilobytes. Now, if you save a file, let's say, a word document that is 1MB in size, the first 1000 squares will now be 'filled' up. After saving a word document, you saved another image 1MB in size. The disc writer will now write onto the first avaible free space, which is next to the word document you just saved. After that, you went back and edit the word document, made it 700KB, the last 300KB of the data won't be physically erased, but is marked as free space instead. Now you save another media file which is another 1MB in size, the disc writer will find the first available free space(which is the 300KB you just 'freed' out), and write over it. Thus, the media file will split into 2 portions, 300KB will overwrite the 'freed' word document space, and 700KB will be written next of the image file.

While you're saving, editing, deleting and overwriting files in your harddisc, those file fragments are probably scattered all over the harddisc. As time passes, your system may run slow because it have to spend much time on finding thousands of fragments to open a single file. That is why regular defragmentation is able to speed things up a bit by rearranging the file fragments, grouping fragments of same files together to make retrieving data easier and faster.

1 comment:

retrieve deleted files said...

Bookmarking now thanks, a good quick read.