I also have one more question is that if i get it formatted and partitioned. Can transfer my new external hd (with info) to another computer without formatting it but and transfer the data.
If by the above you are refering to data only, yes. If you are talking about everything (the OS/user profiles, programs, and data files) then it is more complicated, but I think you are just refering to data file (word documents and other user created data).
depending on the type of case material and design, you might be able to mod/add a small 40mm fan. If the case is metal/aluminum, you might be able to just get a small portable fan to blow on it. If your enviroment is relatively dust free, might be able to remove the front panel on the enclosure and have a fan blow on it. Heck, any kind of air flow would likely help reduce temp.
One of those cheepy 4" fans that can run on AA batteries would do the job. I have a 5.25" Macally aluminum enclosure that does not have a fan. Extended use of the WD 160GB drive has causes some problems for me, so I leave the case partly open with a 80mm fan blowing on it (mabey I am just a bit paranoid.) I once opened the enclosure and touched the drive, it was almost painfully hot.
it in my ned external hd.
not sure what "ned" is.
A ventilated 3.5" enclosure might dissipate heat better (larger enclosure might trap more hot air).
So you did get the computer to recognize it once? You should not have to reformat if connecting to another computer. Something else must be going on. Which filesystem did you use? (NTFS, FAT32). If you used NTFS, only WindowsXP & Windows 2000 would be able to read the drive, If FAT32 windows 98 and onwords should be able to read the drive. Formatting/partitioning should only need to be performed once.
You might have some kind of conflict/incompatibility between your computer and the chipset of the enclosure. If that is the case, flashing the case's firmware might solve the problem (if there is an update for it).
One way to find out what chip is used in your enclosure is to actually open it and look. There should be info printed right on a black square shaped chip on the small pcb. Beyond that, I am stumped.