Secure USB Stick / External Drive

I have an external harddisk and an usb stick. I use them sometimes with pc and sometimes with laptop. Operation systems are not same always, also sometimes windows xp, sometimes vista or linux ubuntu etc. I dont have admin-root like access to install new software there always. I want nobody else get access to my external-disk and usb drive. I know it is possible with TrueCrypt but I cant install truecrypt everywhere and I dont want either. And I am not sure if truecrypt works with all operation-systems and file-systems like fat32, ntfs, rsfs, ext3 etc... Any suggestions?

at first you need to format you harddrive with a file system which can be readed from linux and windows. linux can mount NTFS, FAT32 partition, but windows can't mount linux partitions with filesystem like ext2,ext3...
That means the easiest way ist to format you usb/harddisk with FAT32 or NTFS. If you want to create a container which is bigger than 4 GB, you should format your HD with NTFS, because in FAT32 filesystem you can not use files which > 4 GB.

You can use truecrypt to create a container, you can just need to install truecrypt on your linux or windows box to mount it.

for more just check the site

http://www.truecrypt.org/docs/tutorial

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