

I'm hoping the information I found is wrong and you have success, but it doesn't look good for that drive in your mac. Also, the place you bought that drive might be willing to help you. Since Apple wants and only supports you when you install Apple approved drives (since they make sure the fit and firmware are all compatible), your best bet is to contact Samsung to see if that drive is tested or needs certain pin settings / firmware for use with Leopard and your mac. If you have reset the NVRAM, reseated the HDD and tried resetting the NVRAM after the reseat, then it's looking like something hardware has failed or the drive won't work with your hardware. You might want a drive that works with Macs and PCs, or maybe you want to partition it, which will split it up into two different formats.

You might have luck visiting YourSerialNumber to confirm the marketing name and the manual might list the SATA requirements for replacement drives. Ow to format seagate drive for mac for windows 10 How to Format a Hard Drive for Windows 10 Here’s how to format an external hard drive for Windows 10 or partition it. Formatting the drive will permanently erase all the data and files stored on the hard drive forever.

Before formatting any hard drive, it's a good idea to backup any data or files you want to save before formatting. You can format a drive using the Disk Utility in Mac. Wikipedia shows MacBook 2,1 as either a late 2006 or mid 2007 pre unibody MacBook (white or black) and RamJet notes that 2.5" drives greater than 500GB do not work with pre-unibody macs. This wikiHow teaches you how to format a Seagate Hard Drive on a Mac computer.
