9/21/2023 0 Comments Disk format windows and mac![]() For example 512 byte per sector x 8 sectors per cluster = 4096 byte or 4K. Just to clarify what unit allocation mean, it's the bytes per sector x sectors per cluster. Make sure that the drive mounts on both both machines. If you format it on the PC, make sure that you format it with allocation between 128K and 1024K. In fact, Macs will not mount the 5 Tb drive if it's less than 128K unit allocation and greater than 1024K unit allocation. For a 5 Tb drive, Macs will default to 256K. This is because on larger drives, the Mac will expand a larger Unit allocation, which may be different than the default on a PC. If your drive is formatted with unit allocation larger than that, it will fail to mount. Mac Big Sur can only mount drives with a unit allocation size of 1024K or less. After some experimentation, it turns out to be a unit allocation issue. When I connect an exfat drive formatted on a PC, it refused to mount on the Mac. Mac's exfat is significantly slower than the other file formats.Mac seems to be finicky about unit allocation size.I notice two things about the Mac OS Big Sur implementation of exfat For this post, we will limit the discussion to exfat. I attempted to hook up some usb drives to the Mac and notice a number of different problems: 1) native support for NTFS is rather limited. Recently, I became a Mac user again (I was one back in the 90's).
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