The second drive is mounted in any convenient spot above or below the first, and the flat ribbon cable going to the first drive usually has a second connector part way down the cable that can CAREFULLY plug into the second drive. It is sometimes labeled 'Slave', and only fits one way. Connect a spare power connector to the drive, and set the little jumper in the back of the drive to either CS (cable select) or Slave. These instructions are for older PATA drives that use a wide, flat, ribbon cable. For newer SATA drives, it mounts the same, and the power is the same, but there is a separate thin data cable that connects the second drive straight to the motherboard SATA connector. The computer should recognize the new drive once it's powered up, and will assign it an available drive letter.
It will be in its original state.
Are you mentioning about the partition magic discs
Yes, they are reusable. What getting harder is finding a computer to use them on.
If you are talking about a Dell which has crashed, you lost everything anyway (unless you backed it up on an external hard drive), so just use the recovery discs. IF you do not have the recovery discs, just call Dell's 800 number and order them (make sure to have your serial number & model number handy).
A CD-R or CD-RW or DVD-R or DVD-RW will do.
By its in-use-lite
You have been infected by a virus. Update your antivirus and scan it. On the other hand use the tool below, it will no doubt fix your problem.
Information is written, and read from the hard drive.
No, computer towers do not have slots for cassettes. Older models used to have slots for floppy discs, and current models usually have slots for compact discs, but they were never designed to use cassettes. And even the very early computers that did use magnetic tape, used reel to reel tape, not cassette tape.
no because if it was you couldn't use a computer.
False, They can use optical storage discs.
You can set up multiple user accounts on a Mac but only one user can use the computer at a time. If by devices you mean external hard discs, printers, cameras, midi keyboards etc. etc. then yes that will not be a problem.