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Discussion in 'Mac Accessories' started by kocoman, Apr 10, 2013.
How to check if the HDD is using 4k Advanced format in osx? thanks
4 kB support is implemented in the HDD firmware. AFAIK, (Mac) OS X uses 4 kB blocks for all file systems on GPT formatted disks. That means all HFS+ startup disks on Intel Macs are automatically 4 kB block compatible.
Secrets of the GPT
Apparently, it's *also* implemented in interface hardware.
So, you could have a perfectly fine 4k-block-size HDD, using an up-to-date version of Mac OS X, and yet only see a fraction of the hard drive be available for storage due to an outdated USB interface chip.
Some folks have bought bare 4TB drives, then installed them into cases with outdated interface chips, then see only 900G be available to them.
These cases aren't necessarily old either.
That's true, but there's more: the OS, when creating the partitions, has to recognize that kind of disk, and create them properly aligned.
For example, Windows XP and Vista (without SP1) cannot create correctly aligned partitions for the AF hard disks (see the "Aligned Versus Unaligned Hard Drive Partitions" chapter in the link), and that can degrade a lot the performance
Its only windose installs that have an offset that causes performance problems that require alignment to correct (perhaps only windows XP or Vista and earlier, I dunno). Both OSX and Unix have never had an issue.
I think the only way to determine if 4000k is in use on a Mac is to go to "about this mac" to find the disk vendor and model and then look it up in the disk vendor's data sheet. If its a 4K disk, then 4K is being used.
4k can be seen in windows, Linux...but nothing for osx.?
Everyone just said it works fine in OSX. What else are you looking for?
I have an af 4k 512e drive that one USB to sata adapter works and not the other. The one that does not work will show only the 0xee gpt protective mbr partition. I just want to debug that.
For as long as Mac has used GUID partition scheme it has supported 4k drives. 4K drives were designed to fix the fact that standard drives were designed around sector size used for MBR.
512e is Windows BAD implementation of supporting 4K drives.