Seagate 1.5TB doesnt work with mac

hi, i have a seagate external hard drive 1.5 TB, i generally use it for my windows laptop. now i bought a mac and it doesnt work with my mac. Am i doing some thing wrong..?

Are you planning on using the drive with Windows? If no, then use Disk Utility in Applications/Utilities to reformat the drive. Formatting erases contents on a drive. Copy the data to another source before formatting.
Format the external drive as Mac OS Extended (Journaled) - Partition Map Scheme: GUID
Select Drive (top name) then click on Erase tab.
Under Format select Mac OS Extended (Journaled)
This should format as GUID when erasing but sometimes you need to click on an Advanced tab and select GUID.
If you do plan on using the drive with Windows machine, format on Windows machine as exFAT.

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