Unless you(or someone else) added a second hard drive since the purchase there is only one hard drive. Most of the major PC companies include a partition on the hard drive which contains the restore image in case anything goes wrong with windows to restore the system to factory defaults as if you just opened the box again and turned it on. They do this instead of giving you the windows CD so they can include their bloater ware such as HP help desk.
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Discs and SSDs Solid State Drives
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Yes you can transfer files between 2 hard drives. Make one hard drive a slave and another the master.
The computer BIOS will decide which will be read first.
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Toshiba hard drives, as are most USB 2 drives, are fully compatible with Mac OS X. (See links below)
When you partition a hard drive into two or more partitions (storage areas) those extra drives are called logical drives. So you can have 2 or 3 or more logical drives on one physical hard drive. It varies.
The 2 main data transfer modes are UDMA and PIO under the ATA or IDE hard drives. Many recent hard drives use SATA and have PIO to fall back on if there is an issue.
1.pata 2.sata 3.scsi
Yes, They are used to move the hard drives. The hard drives spin very fast, and they use magnets to achieve that speed. just don't hold a magnet 2 th computr or u will end up with a messed up / not working computr : /