Deleting Windows from a multi-storage PC

I have two storage drives: one HDD and another SSD. I installed my Manjaro on my SSD and Windows on HDD. But, I want to delete windows os from my HDD. The Windows OS taking more than 40 GB space. Is there a safe way to delete the C: partition of windows without harming the other partition on the HDD? My partition details are following:
Disk /dev/sda: 931.53 GiB, 1000204886016 bytes, 1953525168 sectors
Disk model: ST1000LM035-1RK1
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disklabel type: dos
Disk identifier: 0xb99c18cd

Device Boot Start End Sectors Size Id Type
/dev/sda1 2048 1026047 1024000 500M 7 HPFS/NTFS/exFAT
/dev/sda2 * 1026048 210946047 209920000 100.1G 7 HPFS/NTFS/exFAT
/dev/sda3 210946048 646586367 435640320 207.7G 7 HPFS/NTFS/exFAT
/dev/sda4 646588416 1953521663 1306933248 623.2G f W95 Ext'd (LBA)
/dev/sda5 646590464 1082232831 435642368 207.7G 7 HPFS/NTFS/exFAT
/dev/sda6 1082234880 1517877247 435642368 207.7G 7 HPFS/NTFS/exFAT
/dev/sda7 1517879296 1953521663 435642368 207.7G 7 HPFS/NTFS/exFAT

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  1. Make a backup of your data.
  2. You can delete Windows partition, but the Windows boot entry in grub remains.
  3. Then you can manipulate the partitions with Gparted.
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Deleting a partition doesn't touch the ones next to it.
Usually.

Thanks for the reply. But I don't have 1 TB back up storage for the HDD

You can get a cheap 1 TB HDD on Amazon for about $50. Look for Western Digital Blue, they are cheap and quite reliable, though slow (but for backup, good enough).

It's a good idea to keep backup of all important files regardless of whether you're messing with partitions, because storage devices fail, like anything else. And especially if you're going to delete partitions.

The question is: is saving $50 worth losing your data? If yes, then you don't need a backup, just do the steps above and hope for the best. But keep in mind, given enough time, your storage devices will fail, this is quite inevitable: even the best HDDs don't last forever. All hardware can be replaced, but the data cannot.

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  1. Backup, please! You should be running a backup already: now is the time to make it formal!!!

  2. Delete the Windows partitions from within Manjaro using partitionmanager if running KDE or gparted if running Gnome.:
    a. there is a C: drive, a recovery drive and most of the time a security drive too that are hidden from within Windows!
    b. for my system see a screenshot from my SSD using KDE Partition Manager:
    Screenshot_20191226_192527
    In my case, /dev/sda2, /dev/sda3, /dev/sda4 are the Windows partitions.

    Warning! /dev/sda1 is the EFI partition (aka "the BIOS partition") and is linked to your computer, not Windows!

    We cannot tell you which is which from the output you've provided! Only you know your system!

  3. After you've removed the Windows partitions, to remove Windows boot files from EFI, execute:

    sudo rm --recursive /boot/efi/EFI/Microsoft/
    
  4. to update the grub boot menu, execute:

    sudo update-grub
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