To identify your drive, retrieve the model number, serial number and firmware revision without removing your drive. There are multiple methods:
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Seagate DriveDetect.exe method (recommended):
Click here to download Drive Detect.
When running Drive Detect you will see a screen like this. Look for the drives that are attached:

In the example above the Drive Name is the same as the Model: ST31500341AS, the serial number is 9VS00J20 and the firmware revision is SD1A.
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Device Manager Method:
Use Microsoft Windows Device Manager to see the model numbers of your disk drive.
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Choose Start | Run | type: devmgmt.msc
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Click OK.
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Expand the Disk Drive branch to see the model numbers:

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SeaTools for Windows Method:
Download SeaTools for Windows which displays all of the required information. -
Non-Seagate USB Devices with Seagate Drives Inside:
Seagate USB devices have the serial number printed on the external case. For others, please see Document ID: 213111 and Document ID: 219711.