Can't set filesystem to rw after crash

My Mint crashed twice yesterday. Googling for frozen system with flashing caps and scroll-lock LEDs made me believe it was a hardware problem. I carefully cleaned everything, and the hardware seems to work ok again - I had no more crashes. Today I tried downloading a file and I got a pop-up saying the disk is write-protected. Also, apt-get update returns me a lot of errors about "read-only filesystem". I tried this and this . Here are the outputs: `# blockdev -v --setrw /dev/sdb set read-write succeeded.` `# mount / -o remount,rw mount: cannot remount /dev/sdb6 read-write, is write-protected` `# hdparm -r 0 /dev/sdb /dev/sdb: setting readonly to 0 (off) readonly = 0 (off)` `# mount / -o remount,rw mount: cannot remount /dev/sdb6 read-write, is write-protected` I tried both blockdev and hdparm using /dev/sdb and /dev/sdb6, and running # echo $? after each of them always returns 0, indicating success, but nothing seems to work. Also, my /home folder is at /dev/sdb7 and I can write files normally to it. Here is the output for # fdisk -l Disk /dev/sdb: 931,5 GiB, 1000204886016 bytes, 1953525168 sectors 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: 0x0005683d Device Boot Start End Sectors Size Id Type /dev/sdb1 * 976963584 1953523711 976560128 465,7G 7 HPFS/NTFS/exFAT /dev/sdb2 2046 976962885 976960840 465,9G 5 Extended /dev/sdb5 2048 2000895 1998848 976M 82 Linux swap / Solaris /dev/sdb6 2002944 41062399 39059456 18,6G 83 Linux /dev/sdb7 41064448 976962885 935898438 446,3G 83 Linux The /dev/sdb1 is a NTFS partition I made to be accessible from Windows, which is at /dev/sda. Any ideas on how I could fix this? Thanks for your patience.