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I have a Dell T7600 workstation with four 1.82 TB drives in a RAID 5 configuration. Here is a diagram from MegaRAID storage manager:

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Given space for parity, this leaves me with approximately 5.5 TB of space to allocate. I understand Windows limits a single partition to 2 TB. My partitions are arranged thusly:

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I have three blocks of unallocated space I'd like to use. The first is 4 MB in between the FAT and the E:RECOVERY partition. The second is a very tiny 1 MB block between the C: drive and the larger unallocated partition of 3539.5 GB. I am unable to completely remove or allocate any of the three unallocated partitions. I've got the native Windows 10 Disk Management tool, and I tried the free Partition Wizard 9.1 MiniTool as well. If I try to create a partition in the larger space, I am only given .88 MB to use! Partition Wizard doesn't even show the 1mb space in the table (I ended up with this tiny bit of space because I extended the C: drive into that space hoping to utilize all of it. To my surprise, I couldn't use the entire block!

How do I absorb the remaining blocks of unallocated space, or combine them or move them? If I try to create a partition in the 4MB space it only ends up being 3MB with another 1MB block of unallocated space in front of it.

  • the other limitation you can be getting is minimum file tables sizes, alignment even if not an "advanced format" drive and isnt cylinder alignment still in play for partition walls? Then the block size of any raid that works that way. and cluster size , which does not come into play yet. I dont really know, just that usually you cant just add a sector or 2 here and there with the partition walls, it moves in larger chunks. Moving the partition (with re-alignment) would be the common way to shift an unallocated space (small or not). Moving needs backup of the data, and moves data,takes time – Psycogeek Nov 13 '15 at 5:50
  • I'm not given the option to move them, which seems odd to me. Even the small ones. I'm reflecting on cloning the thing to a smaller drive with Macrium and doing away with the Perc controller and just going off the SATA port. The way it is now is a waste of disk space. – user1780242 Nov 13 '15 at 5:54
  • That way I can clone everything but the dead space and configure the way I want it distributed on the target drive. – user1780242 Nov 13 '15 at 5:56
  • I think windows only does minor sizing stuff and completly safe moves and all, "pro" versions of various parititoning sofftware provide for all that control, and a real "move" of a partition is done completly offline, and can take loads of time when there is data there. The massive data movement , and the partition table correlation need, makes it dangerous (i prefer to complete all this once, before fill, but have done it many times filled Yawwn) – Psycogeek Nov 13 '15 at 6:00
  • 3rd party partitioning software also seems to show better what is really going on, provides for better visual GUI bumping of the sizes you can use, automatically aligns important stuff this week (as some of that changed) , and can give better Hover information, combined with help files, and listed execution activity that will "need" to occur – Psycogeek Nov 13 '15 at 6:06

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