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When I was installing windows 7 on my mac I allocated 55GB to my bootcamp partition, I now realise that it is not enough for me. is there a way to extend it, without loosing any data and re-instaling windows?

Additionally, is it possible to store files on Macintosh HD partition (as it shows up when I access my computer from windows) while using windows? That would solve the problem, however I'm not sure if it will work.

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This should work:

1) First, shrink an adjacent partition to make room using Disk Utility in MacOS:

  • Launch Disk Utility in MacOS
  • Identify the Windows partition and the adjacent ones
  • Using Disk Utility, shrink one (or both) adjacent partitions

2) Then in Windows, expand the bootcamp partition.

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what do you mean buy that? Should I make another partition like 15GB and than merge it with bootcamp one? I don't understand. – Ilya Knaup Dec 28 '12 at 10:07
Breakdown of step 1: a) Launch Disk Utility in MacOS b) Identify the Windows partition and the adjacent ones. c) Using Disk Utility, shrink one (or both) adjacent partitions. – Matthew Elvey Mar 3 '13 at 18:52

For all my partitioning, I use and recommend iPartition.

iPartition allows you to modify Boot Camp partitions just like regular partitions. iPartition will reconfigure the Windows partitions automatically.

You can use iPartition on drives that contain Boot Camp volumes; in fact, you can even resize your Windows partitions, and let iPartition take care of reconfiguring the Windows boot process for you.

iPartition Screenshot 1

iPartition Screenshot 2

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I second the recommendation for iPartition, I've been using Coriolis Software's iPartition & iDefrag for many years - seemingly bullet proof, and will allow you to shorten the Mac-HD partition & lengthen the Windows partition in one operation.

Alternatively (or as well), for Windows to be able to see (have r/w access) to a HFS+ partition, you need a HFS+ file system driver installed in Windows. I think there's free ones, but I have used & can recommend Paragon Software's pair of file-sys drivers, for Windows to access HFS+ partitions, and for Mac to have r/w access to NTFS partitions (by itself Mac can only read NTFS, not write).

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AFAIK the Boot Camp WindowsSupport drivers allow Windows to read/write to HFS+ without the need for 3rd party software… – grgarside Sep 25 '13 at 7:26

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