Making two small hard drives into one big partition, so i can install jsdk

I want to install jsdk but my hard drive isnt big enough. I connected a second hard drive to the same cable as my 1st hard drive, i want to make one partition. Is that possible? How can i do it so to harddrives look like one hard drive when i open "My Computer" I have fdisk, but what do i choose to partition it correctly?
thanks,
N

i explain what i know but if i am wrong maybe some others will correct me:
From what i know, there is no way to auto fill the second when the first is filled. BTW the first will not be filled because if it does, there wont be enough space to run your other program.
Master and slave is like a primary harddisk and a secondary hardisk
Master is where your OS resites and is commoly known as C drive whileas secondary can be your D, E , F( i am refering to harddisk not your CD-Rom or floppy drive)
Logic partitioning is where u separate your one hard disk into several parts... Like u can separate your C into several shelves to store things. No conflict will arise if same filename is found in the C drive.
Extended is where u separate the separated portions of the hard disk... like separating one shelf into two: one to keep your books and the other to keep your pencil etc.

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