A moment ago I unmounted my 1TB HDD with 400GB of content and I partition it into two different partitions, obviously keeping the space that was already occupied. I did because I don’t care if the content get corrupted, but after I did it everything is still working perfectly, when I thought everything would be corrupted.

I am possibly a complete ignorant on this subject, but due to the nature of the HDD and how it writes and reads data I expected it to corrupt everything, why didn’t it happen? On an SSD on the other hand I would not consider that possible because it is not even a mechanical part where the information is stored.

  • wmassingham@lemmy.world
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    1 year ago

    Storage media doesn’t make a difference here. You can partition a spinning drive, an SSD, NVRAM, phase change storage, hell even magnetic core if you have enough of it.

    It also depends on how you did the partitioning. A full partitioning program like gparted will intelligently move and resize partitions. But even if you blindly rewrote a partition table, if you did something like take a 100gb partition, changed it to 50gb, and added a 50gb partition after it, as long as the filesystem has only used that first 50gb, nothing bad will happen. A partition table just says “partition starts here, ends here”.

    Just look at the output of fdisk:

    Disk /dev/sda: 100 GiB, 107374182400 bytes, 209715200 sectors
    Disk model: Virtual disk
    Units: sectors of 1 * 512 = 512 bytes
    Sector size (logical/physical): 512 bytes / 512 bytes
    I/O size (minimum/optimal): 512 bytes / 512 bytes
    Disklabel type: dos
    Disk identifier: 0xaf179753
    
    Device     Boot     Start       End   Sectors Size Id Type
    /dev/sda1  *         2048 192944127 192942080  92G 83 Linux
    /dev/sda2       192944128 209715199  16771072   8G  5 Extended
    /dev/sda5       192946176 209715199  16769024   8G 82 Linux swap / Solaris