Please somebody Help me i have Seagate ST380817AS 80GB Sata harddisk fried. in this one component is burned.value of this component is QE R521. i cannot identify this componenet whetere it is a diode or resister or capacitor.please some body help me to replace this component with proper value and equivalent value.thank u

Shannu, post a good quality picture of ur PCB component side up.

Please somebody Help me i have Seagate ST380817AS 80GB Sata harddisk fried. in this one component is burned.value of this component is QE R521. i cannot identify this componenet whetere it is a diode or resister or capacitor.please some body help me to replace this component with proper value and equivalent value.thank u

Search TVS

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You don't have to backup all of your files, just the ones you want to keep.

Yeah. Its a TVS diode. Snip it out and ur hdd might work if the spike have not done any additional damage. Search for TVS like DRC suggested for additional info ( tons of it on the forum )

See my notes:
http://www.users.on.net/~fzabkar/HDD/TVS_diodes.txt
http://www.users.on.net/~fzabkar/HDD/HDD_ICs.txt

Here is the datasheet for your TVS diode:
http://www.onsemi.com/pub_link/Collater ... 0AT3-D.PDF

For continued protection, you can substitute it with an SMAJ5.0A available from Farnell, Mouser, Digikey.

QE is a marking code identifying the part number.
R521 is a date code indicating week 21 of 2005.

Thanks fzabkar i repaired it thank u