I have 1TB of trascend external drive but now it allow me to store only on 30MB space the rest i cant access

Actually you do not have full access even though you are the administrator.
Right click D drive
Properties
Open security tab
Click on authenticated users, and click on edit
Check full control under allow.

Depending on the Operating System you are using (i.e. Windows or Mac OSX etc.), they deal with deleting files in different ways. In the case of an Apple Mac, it doesn't actually delete you files, but instead moves them to the recycle bin which is located ON your external hard drive. This means that in order to make the space available, you have to empty your recycle bin on your desktop whilst the hard drive is plugged in and it will empty the folder for you. Or look for a hidden folder on the root of your Hard Drive called Recycle and delete it (it will be recreated by your system when your system needs it).

Alternatively, 1TB is a large drive meaning that it is possible that your file structure has become "fragmented". Don't worry yourself with the specifics, but if you right-click on the drive and access the Properties, choose the Tools tab and use the Defragment tool. Also it might be worth using the Check Disk For Errors option, although Defragment is more relevant in this case.

If you run through these basic troubleshooting steps listed above I hope you will gain access to your cleared space.

Hi t rope
It sounds like your hard drive may be faulty, you can try another usb lead to see if this is the problem, otherwise the drive or enclosure may be faulty. Hope this helps.

Only store file on the drive not programs. Working program cause to much ware and tare on the external drives.And a partition on a driver that has programs running from it works real hard because it moving file from two sectors of the drive at the same time. Can you be in two places at the same time?

If it is "brand-new", then it must be initialized, and assigned a drive-letter, using "Disk Management" tool within Windows.

Some part of the drive has "died".

If it still has a valid WARRANTY, exercise the warranty to get it repaired/replaced.

If the warranty has expired, then open the case, remove the disk-drive, buy a new "compatible" disk-drive, connect it, and thus "revive" your external storage device.

Possibly a virus might have corrupted some system files not allowing the external drives to be accessed.

Assuming that the external hdd is physically working fine, everything is pointing to a damaged boot sector.

You can get back most (if not all) your data stored in your external drive with the help of an application called: Pc Inspector File recovery.
Its a freeware.
Here is the link: http://pcinspector.de/Sites/file_recovery/download.htm?language=1#

Simply install it on your C:\ drive, and follow the prompts.
Please let us know the outcome.

Don't forget to rate this answer if it helps

First of all, restoring a hard drive rarely affects data stored on it. I usually just adjusts the supporting software that allows it to run properly. Definately check the manual prior to restoring it, though. Formatting it will absolutely erase everything (unless your the FBI). I'm about 99% sure that restoring it will leave your stored data completely unaffected.
You're better off performing the work using the newest OS available. BTW, your BF can plug into the internet and get upgraded to 10.4.11 as well for free and it doesn't take long.

plz formate your drive through cmd after format its not working then your drive is fake space