How do I reformat a fixed-state/pseudo-readonly SD card?

Alright, so this is an ongoing saga of trying to fix my broken SD card. Let me struggle to explain what's wrong with it. **When copying files to the SD card** The files are completely corrupted. For instance, have a listen to Body Talk by Robyn: https://soundcloud.com/nobleuplift/sets/corrupted-body-talk Some songs are mashups of other songs on my phone, or speed up to 4x speed. We Dance to the Beat takes 17 seconds to play. **When deleting files from the SD card** The files/folders will appear deleted up to the point either when the SD card is mounted/unmounted, reformatted, or the phone is restarted. Yes, you heard me right, **reformatting does not delete any data from my SD card**. It is restored to the state it was in two weeks ago when I first noticed signs of corruption. On the bright side, I can still listen to anything I copied to the SD card beforehand with no corruption. **When trying to reformat the SD card by other means** First, I tried to reformat the SD card using Windows XP. I tried both exFAT and NTFS. exFAT failed immediately, whereas NTFS took about 15 minutes before it said it couldn't do it. I tried the exact same thing on my MacBook Pro and here are the logs from trying that: ===== Monday, 2015 June 8 at 11:43:24 PM Central Daylight Time ===== 2015-06-08 23:43:34 -0500: Preparing to erase : “SD64GB” 2015-06-08 23:43:34 -0500: Partition Scheme: Master Boot Record 2015-06-08 23:43:34 -0500: 1 volume will be created 2015-06-08 23:43:34 -0500: Name : “SD64GB” 2015-06-08 23:43:34 -0500: Size : 63.86 GB 2015-06-08 23:43:34 -0500: File system : ExFAT 2015-06-08 23:43:34 -0500: Unmounting disk 2015-06-08 23:43:34 -0500: Creating the partition map 2015-06-08 23:43:34 -0500: Waiting for the disks to reappear 2015-06-08 23:43:34 -0500: Formatting disk2s1 as ExFAT with name SD64GB 2015-06-08 23:43:34 -0500: Reformatting existing ExFAT volume Volume name : SD64GB Partition offset : 0 sectors (0 bytes) Volume size : 124733440 sectors (63863521280 bytes) Bytes per sector : 512 Bytes per cluster: 131072 FAT offset : 2048 sectors (1048576 bytes) # FAT sectors : 4096 Number of FATs : 1 Cluster offset : 6144 sectors (3145728 bytes) # Clusters : 487216 Volume Serial # : 5bc0a34d Bitmap start : 2 Bitmap file size : 60902 Upcase start : 3 Upcase file size : 5836 Root start : 4 2015-06-08 23:43:34 -0500: Mounting disk 2015-06-08 23:43:34 -0500: Could not mount disk2s1 with name (null) after erase 2015-06-08 23:43:34 -0500: Erase complete. 2015-06-08 23:43:34 -0500: So... yeah... Anyone have any idea on how to fix this?