Dec 19, 2017 - As you have backed up the photos on the windows machine, you should try to use disk utility to fix your drive. There might be a volume. That’s not a Mac drive. Have a look at the model numbers at the bottom of this page and also the product ‘Overview’ states that it’s not Pre-Formatted for Mac. It says Requires reformatting for Mac OS X operating systems. 4TB My Passport for MAC is WDBP6A0040BBK.

New: A brand-new, unused, unopened, undamaged item in its original packaging (where packaging is applicable). Packaging should be the same as what is found in a retail store, unless the item is handmade or was packaged by the manufacturer in non-retail packaging, such as an unprinted box or plastic bag. See the seller's listing for full details.

Color: Black Brand Name: Western Digital Manufacturer: Western Digital Product Dimensions: 4.3 x 3.2 x 0.8 inches Model: WDBP6A0040BBK-WESE item_length: 3.2 Brand: Western Digital Hardware Platform: Mac UPC: 96 Item Weight: 8.6 ounces EAN: 036 Item Dimensions L x W x H: 4.33 x 3.21 x 0.85 inches MPN: Does Not Apply Shipping Weight: 12.8 ounces Item model number: WDBP6A0040BBK-WESE Series: My Passport for Mac Style: Mac Flash Memory Size: 4 TB Capacity: 4TB item_width: 0.8 Hard Drive Rotational Speed: 5400 RPM Hard Drive: 4 TB Portable ISBN: Does not apply.