Can i have another operating system in my external hard disk??

for example windows or linux only in my external hard disk meanwhile in my macbook is tiger

Yes, you can if you partition the hard drive. If you want both Windows and Linux, then you need to create three partitions. Your OS X partition must use the GUID partition scheme, but the other partitions must be MBR. Unfortunately, you cannot have two different partition schemes on the same drive. There have been schemes devised to create the different partition schemes needed on a single drive. If you visit www.macosxhints.com you can search for the couple of 'hints' that provide information on how that's done.
If all you want is a Windows partition, then the best thing to do is use Boot Camp to create the partition. You can download the Boot Camp beta directly from Apple's download site. If you do some forum searching you will find many threads discussing the use of Boot Camp and Windows on Intel Macs.

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