I just bought a 250gb 360 slim and im getting it glitched thursday upgrading from my xenon jtag so I took my slim hdd out and hooked it up to my xenon jtag using a sata to usb to transfer over my profiles and content so I used my xbox to format the hard drive and get the stuff I had on it off I transfered over my contents but now my 360 slim wont read the hard drive at all. How do I go about restoring this hard drive back to normal?
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Format it from the dashboard mate...

it wont show up on the dashboard

How did that happen? did you format it on the phat xbox maybe?

yea was trying to carry the contents over from my old jtag 360 to my new slim hard drive had it hooked up using my sata to usb and formatted it on the old 360

hdd hacker doesnt work thats for wd drives I have an original OEM 360 hdd think its a samsung

Since you did that, you turned your HDD to a normal external memory.. so you need to use the hddhcker utility and inject a .bin firmare into it again, to enable it to format normally on your slim. In this case, you have to open the hdd case and check which exact model of HDD is included in the box. Google for more info.