I was running Elementary Loki before I decided to move to a dual boot system. I formatted the entire drive and installed Windows using a UEFI flash drive, through which I had issued a simple clean (on the internal HDD) from the diskpart utility.

I then installed Ubuntu 18.04 after a partitioning table that looks like this:

/dev/sda1: Basic Data Partition : ntfs : 499 MB  
/dev/sda2: EFI : fat32 : 99 MB  
/dev/sda3: Microsoft Reserved  
/dev/sda4: Basic data partition : ntfs : 150 GB  
/dev/sda5: Bionic : ext4 : 64 GB  
/dev/sda7: Shared : ntfs : 713 GB  
/dev/sda6: swap : 4 GB  

The main intent of keeping a shared partition was to access documents and media both, on Windows as well as Linux. Everything was working fine until I created the Shared ntfs partition and moved around 220 GBs of data in it (copying a local backup). Ubuntu restarted automatically and took forever to load. After a forced restart, grub shows up and loading any OS takes forever. Booting into Windows stays hung on a black screen for 1-2 minutes after which it drops to grub's purple background (no text though). Booting through advanced options (not in recovery) gets stuck at loading initial ramdisk

Following these problems, I live booted through a USB to check the output of hdparm. Buffered disk reads averaged at 16 MBps.

To be sure that what was happening is not some random error, I formatted the HDD to one clean partition and recreated the entire partitioning table, and reinstalled Windows and then Ubuntu 18.04. I didn't move anything to sda7 this time, and hdparm output an average buffered disk read of 130 MBps, which again dropped to 16 MBps after I moved all my data (220 GB) into the ntfs (sda7) partition. Ubuntu automatically restarted again and the same results followed.

What am I doing wrong here? Why is it that the HDD becomes exceptionally slow?

Any help would be really appreciated. Thanks in advance.

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