SanDisk Cruzer Blade 16GB write protected error

“No resolutions yet?”

Have you tried writing to it after booting to Safe Mode?

Have you tried detailing what your environment is?  ie what OS are you running, Linux or Windows?  XP or 7?  32 bit or 64 bit?what other apps are you running, especially what anti-virus and anti-malware?  Are you using a personal pc or a school pc?  Schools and corporations can impose write limitations on their pcs.

If a personal pc and WIndows XP or 7 have you tried this option:

1. Open Start Menu 

2. Run, type regedit and press Enter, this will open the registry editor. 

3. Navigate to the following path: 
     HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\StorageDevicePolicies 
4. Double click the key WriteProtect in the right pane and set the value to 0 In the Value Data Box and press OK button 
5. Exit Registry 
6. Remove your Blade

7. Reboot your pc.

8. Re-connect your Blade to your pc. 

Without knowing what your running and what you’ve tried it’s hard to suggest a solution.