I have to agree with John on this one.
I've had a number of SanDisk Cruzer 'Blades' over the past few years; they're pretty cheap for what they are. The 32 GB and 8 GB models have never been known to suffer from this problem.....it always seems to be the 16 GB models that will flip into 'read-only' mode at the slightest provocation.
It was eventually discovered that it all stemmed from a batch of faulty firmware chips that SanDisk had sourced from Hynix. Hynix were aware of the problem, but refused point-blank to do anything about it, citing various legal 'cover-my-ass' type reasons that they claimed tied their hands from doing anything to resolve matters.
The eventual advice from SanDisk, following a huge user campaign (and a very long-running thread on the SanDisk forums), was that if you had this problem, then you should return it to them and they would replace it, no questions asked. What the outcome of all this was I don't know.....but it can't have done their reputation any good.
This particular thread was running for nearly 6 years..! The whole sorry business seems to have eventually kind of 'fizzled out'.....
The moral of this tale would seem to be to spend a bit more on your drives in the first place.....and to give SanDisk a miss. Although, having said that, I use a number of their Ultra 'Fit' nano-sized USB 3.0 drives (including a pair of 128 GB models as permanent 'external storage' in my elderly Dell laptop).....and those have never given the slightest bit of trouble. Apart from running hot enough to fry an egg on.....but that's another story entirely!
Edited by Mike_Walsh, 05 December 2017 - 07:21 PM.
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Compaq Presario desktop; Athlon64 X2 3800+, 3 GB RAM, WD 500GB Caviar 'Blue', 32GB Kingspec PATA SSD, Seagate 'Expansion' 3 TB USB 3.0 external HDD, ATI Radeon Xpress 200 graphics, Dell 15.1" pNp monitor (1024 x 768), TP-Link PCI-e USB 3.0 card, Belkin PCI USB 2.0 4-port card, self-powered 7-port USB 2.0 hub
Dell Inspiron 1100; 2.6 GHz P4, 1.5 GB DDR1, 64GB KingSpec IDE SSD, Intel 'Extreme' graphics, 2 x 128GB SanDisk Cruzer 'Fit' USB 'external' storage.