Maximum Motor Size For Mac

1. Maximum Motor Size For Macbook Pro

First, note that Device Block Size is different from the block size in use by the filesystem. The former value as reported by diskutil refers to the raw block size used by the hardware. I haven't found an easy way to check the latter value by the command line, but you can just create a zero-byte file then do Get Info from the Finder.

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Maximum Motor Size For Macbook Pro

This motor has performed well at 30A, and it sheds heat well, since it is an inrunner. At 48V X 30A = 1,440W, it’s performance is outstanding! But.it gets better than that. The low pole-count means this motor can be run at very high RPMs without excessive waste-heat produced from eddy-current losses. The block size was a function of the disk size in bytes divided by the maximum number of allocation blocks, 65,535. For small disks this was fine, but when disk sizes started to approach 1GB in size the minimum allocation block size was 16 KB ( / 65535) =.

It will say 0 bytes, but 4k used on disk. Second, you can create an HFS+ filesystem with larger than 4k block sizes using the command line program newfshfs. The easiest way is to use Disk Utility to partition the drive and create a partition with the default formatting, then use /bin/df to determine the block device (an example only: /dev/disk0s2). Then unmount that partition (using umount /dev/diskXXX or Disk Utility), and to reformat as HFS+ with 64k blocks do: newfshfs -v VolumeName -b 65536 /dev/disk0s2 Use the Get Info tip above to verify that a small file now occupies 64k on disk (it may say 65k for powers-of-10 units). Performance is the main reason you might want to do this, if most of the data to be stored are large files (such as MP3s, photo, video,.zip files, etc), and it also helps with keeping disk fragmentation low.

Obviously don't bother if you plan on storing mostly small files. I have found that on large drives ( 1 TB) formatted as HFS with the default 4k block size, when the drive nears capacity, write performance degrades terribly. I'm guessing that is due to the partition being fragmented and having to hunt and peck for free blocks in order to write out the last 1% of data.

I'm hoping that larger block sizes will alleviate this problem somewhat. With the older HFS file system, Apple's second attempt at a file system for the Macintosh, there could only be up to 65,535 allocation blocks on a disk. The block size was a function of the disk size in bytes divided by the maximum number of allocation blocks, 65,535. For small disks this was fine, but when disk sizes started to approach 1GB in size the minimum allocation block size was 16 KB ( / 65535) = 16384.25, but you need to truncate to 16384. What this means is that a 1 byte file on a 1GB HFS disk required 16,384 bytes to store on the hard drive, so there was too much wasted space. So Apple created the HFS+ wrapper to reduce the wasted space. There may be a way to set the block size higher, but why would you want to?

Here is a quick bash script that will list all of the diskinfo output for all of your currently connected disks. #!/bin/bash for disk in /dev/disk.s. do diskutil info $disk echo '.' echo ' ' done.