How to see what's taking up my storage? - Android Q&A, Help & Troubleshooting

I recently purchased a 16gb microSD card for my SGS2.
I haven't transferred any songs or pictures to the card (I do have some on the phones memory though) yet, somehow, space is being used up on it. I do download games/apps regularly however as far as I know they are set to install onto the phone's memory.
Is there a good way to see what files are taking up space on the USBStorage, SD Card, and System storage?
Is there a good app that'll allow me to see what files are on what part of the phone, details etc? A computer app or a phone app is fine, if such exists.
I'd like to have full control over my storage as the Task Manager/My Files doesn't allow me to do much.

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Download ES File Explorer. Go to Menu>Manager>SD Card Analyst.
ES File Explorer - https://market.android.com/details?id=com.estrongs.android.pop&hl=en
Click thanks if I've helped you.

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You can see what apps are taking up the most storage in the Settings menu in Storage and Storage usage.
If you're rooted you can get to the root filesystem on your device using a file manager.

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I installed Astro Manager but it's not quite what I'm looking for. It'll show me what files are taking up the USB Storage space (the approx. 2.45GB), however how can I find out what's taking up the 16.47MB on the microSD card?
I've plugged the phone into my PC with USB debugging mode ON (to be able to see the microSD card), and there are no files showing, except the LOST.DIR directory which has no files in it. Very strange.
Also, what about the files under System Storage? How can I see which files take up that space?
I wish there was the feature to click on each section under the Storage tab, and that would show you the files under that directory so you can see what is taking up the respective amount of space. If there's such an app, that would be great.
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System Storage is where your apps are installed to.
As for the SD Card, the only thing I can think of is to make sure you have Windows set to show hidden and system files and then mount the SD card to your PC and check it for hidden files.
Failing that, format the card.

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There is no way to see the files that take up the space in System Storage?
Edit: I've done as you've said, and now I see what is taking up the 16.47MB on the external microSD card. Which leads to my next question. They are 3 .asec files which are from games that I currently have installed.
What are .asec files and can they be removed?

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kofte said:
There is no way to see the files that take up the space in System Storage?
Edit: I've done as you've said, and now I see what is taking up the 16.47MB on the external microSD card. Which leads to my next question. They are 3 .asec files which are from games that I currently have installed.
What are .asec files and can they be removed?
Click to expand...
Click to collapse
Are you rooted? If you are, most file managers should be able to get you to the root directory (where your android core files reside)
As for what are .ASEC files, it appears to be a file format used by the phone to store apps or app data in an encrypted file. If you remove them you might lose some apps or app data.
http://www.fileinfo.com/extension/asec
Not sure if this will be available on yours, but you can go into Settings > Applications > Storage usage to see what apps are taking how much room.

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never mind, misread your post.