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I have a sony vaio vpcf121fx laptop with windows 8.1 currently installed in it..i have never dual booted ubuntu in my laptop before..i have a 1 TB hard disk and its divided into C:,D:,E: and F: partitions with C: storing the current windows 8.1 OS....i want to allocate about 25 GB of storage space for ubuntu...and want to allocate that 25 GB memory from E: drive which currently has 300 GB free out of 345 do i go about doing it... i have a vague idea about shrinking the drive or something..but i dont know anything about it...could someone please explain the exact steps that i must follow in order to ensure that i successfully install ubuntu 14.04 without losing the data stored in the hard disk currently?

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In Windows 8.1 go to search(right side of the screen) and type "Disk Management".
Select "Create and format hard disk partitions".
Right click on E: and choose "Shrink Volume".
Enter the values and you will get new unallocated space near E:.

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