Ultra Fit USB 3.0: Excessive Heat

The metal will conduct heat far better than using a naked board.

What do you think heatsinks do? They dissipate heat from the main board by spreading heat over a larger surface area. The metal is crucial in this.

That is exactly what the extension intends to do, but more effectively. A naked board is not an effective solution.

sure, I must have missed the copper and heat conducting paste when opening. 

Anyone know why it doesn’t run board only?

Does it work when you reassemble it? You might have broken it with your clumsy handling :stuck_out_tongue:

“Anyone know why it doesn’t run board only?”

It wasn’t designed to run that way?

I am seeing a mirror image of mine. Hats of to you and you have proved their design is wrong. Very happy to see you post here

"Anyone know why it doesn’t run board only? " - well my iphone doesn’t run screen only. Any guesses why? :slight_smile:

Don’t worry about heat. It shouldn’t get too hot to operate. If it does, the manufacturer failed you so you can get it replaced. Just be sure to be reasonable and keep it fairly well ventilated.

Don’t worry about heat. It shouldn’t get too hot to operate.

If it does, the manufacturer failed you so you can get it replaced.

Just be sure to be reasonable and keep it fairly well ventilated.

I believe the concern is the laptop USB port it is connected to as well as the data in it.

Replacement only cover the USB Flash Drive, not the data neither the laptop USB port (if it is damaged due to overheat from the USB Flash Drive).

While other manufacturer also does not provide any warranty to cover the data (in case of loss) neither the USB port of any laptop, however, the USB Flash Drive from other manufacturer does not operate under that high temperature (at least the temperature of the touchable surface of the USB Flash Drive).

The workaround is to use extension cable, but other’s opinion is also valid as like why should I buy a tiny USB Flash Drive but end up with attaching an extra USB cable? It against the tiny design!


So, its been a while, and I’d like to comment back on this USB. I’ve had it for over a year, run several Linux distros on it, and currently use it to store ROMs/Kernels/Flashables for my Nexus and Galaxy phones- in short, it works great as small expandable storage.

As a USB 2.0 device, that is. I’m highly disappointed in the heat department when used as a 3.0 device, but for such a small USB and form factor I’m not surprised. When I need to get stuff done, 3.0 does the job but man, the heat is  insane.

Even so, USB 2.0 speeds and heat development are actually very decent. Read is around 70 MB/s while Write is around 50 MB/s. Nothing blazing but plenty fast for any self-respecting Linux distro out there. Heat is no problem when connected to a 2.0 port- for a few months I was running Steam games daily from it.

So overall, for the $11 I spent for this little guy I’m satisfied. I think Sandisk ought to inform customers, however, as there are many people in this thread who haven’t had nearly as rosy an experience as I.

yes i also having this problem i bought just on 10 feb 2017 can this be exchange or repair but i dont have bill but i have box

Well, I feel I’ve got to add my two-penn’orth to this saga.

I use a pair of the 64GB Ultra Fits as external storage on an ancient Dell Inspiron laptop…an original 1100, from 2002/3.

I run ‘Puppy’ Linux on this (which as y’all know, runs entirely in RAM; Puppy ‘lives’ on a 64GB KingSpec IDE/PATA SSD). The drives are formatted as ext3, and are used purely for data storage. Like many others on here, I too have found that they run pretty hot…but my observation, over a period of time, is that they run hot up to a point (but then no hotter.)

I’m guessing that the R&D guys have determined that the heat levels are acceptable…but I have to agree with xcalibur, back in post#35; I too think it’s a basic engineering problem. You’re cramming 128 GB of NAND flash memeory into something that small, along with all the necessary controllers, etc, and then running at 130 GB/s read speeds, something’s got to give…and it comes out as heat.

I’ve never had the problem exhibited by joeydee, in those rather alarming photos he posted. The plastic ‘end-cap’ on my own Ultra Fits does indeed get warm…but again, only up to a point. I’ve examined the plastic surround of my own USB ports, and there’s no actual sign of any damage. Mind you, this machine runs a full desktop Northwood Pentium 4…and the older guys amongst us will remember how insanely hot those things used to run. It’s quite possible Dell took that into account when designingthe 1100s, and accordingly used suitable thermoplastic in the construction…

I run a 3rd 64GB Ultra Fit plugged into the back of our router, as a small NAS drive. It works fine, and in fact gets nowhere near as hot as the others do plugged into the lappie. Overall, I’m quite happy with my Ultra Fits; I’ve been using SanDisk flash drives for years, and with the exception of the Cruzer Blades, have never had any complaints.

(It’s no joke when you take a ‘dodgy’ Blade apart, and find out there’s only the stub of a circuit board inside it, with the USB contacts…and NOTHING ELSE. No NAND flash chip, no controller circuitry; weird…!)

I’ll reserve judgement on that one…

Mike. :wink:

I just bought 2 SanDisk - Ultra Fit 32GB USB 3.0 Flash Drives from Walmart and after a few mins I noticed the metal case on side of my MacBook pro where one unit was plugged in became warm to the touch and when I removed the drive the metal shell was so hot it was nearly untouchable. I noticed this on an Android tablet and that it noticed it cut my battery time by 40% when just setting idle. I’ve got an old Cruzer Fit that does not get hot like these things do!

Thinking it may be due to some constant data access I plugged it into my Iphone USB power adaptor and it becaame very hot as well,  so it can’t be due to data access. 

As hot as this unit gets seems not normal, and with all the reports of hot drives  going on three years now on this thread alone, I’m wondering if it could be a counterfit issue? 

i would like to share my experience with Ultra Fit 3.0-16GB.I’ve used it in my Sony Car Audio System. But after few months i’ve found the heating issue. It became so hot just few minutes after inserting that couldn’t be touched on the metallic portion.Few months later it started showing problems like, the flash drive is undetectable after getting heated just after inserting it. It becomes a useless one. SanDisk should solve the problem or stop selling this product.

So has SANDISK offered to give anyone a 2.0 in exchange or anything else? I know this is a OLD post but just got mine about a month ago & just tried to use it for my motorcycle stereo. ITS INSANELY HOT & I will not use it with chance of doing damage. I have the 64GB 3.0 it gets crazy hot in no time flat in a stereo, my pc or my mac!!!


Well, well, well. Yet another long-running thread about an unresolveable problem… :smileyvery-happy:

I went through the ‘write-protect’ saga with the Cruzer Blades. I still maintain they’re good little drives for the price, as long as you don’t try to use them to extremes.

As for the Ultra Fits…yeah, the little buggers do run hot, it’s true. But even in a USB 2.0 port, the transfer speed is nothing short of astonishing. And in a USB 3.0, it climbs into the stratosphere…

I’ve got 2 of the 32 GB models. I’ve got at least 3, if not 4, of the 64 GB models. And in the last year, I’ve splashed out on 3 of the 128 GB jobs, too. (These latter three are formatted to ext3; one is used as a miniature NAS in our router, and the other two are used as permanent ‘external storage’ in a 15-yr old Dell Inspiron laptop running ‘Puppy’ Linux. They’re not used for system stuff - although Pup’s mode of operation keeps system read/writes to an absolute minimum anyway (it’s one of these distros that runs totally in RAM, and only writes config/settings to the flash drive periodically) - but simply for data storage, to supplement the 64GB SSD ‘upgrade’ that hosts Pup itself.

I’ve tried these in FAT; ex-FAT, and also NTFS, in addition to Linux formats. Even BTRFS. Doesn’t matter what format you run 'em under, they will get very hot. One of the other posters, several pages back, hit it on the head when he/she stated about the laws of physics prevailing; cramming an enormous number of transistors into a teeny space, the heat produced has got to go somewhere. And in this case it’s the miniscule metal shell…which, let’s be fair about this, does do its best to try and dissipate that heat, despite having its work cut out from the ‘get-go’! :confounded:

The QC guys must have determined these weren’t going to get hot enough to cause major problems…although joeydee’s pictures don’t exactly inspire confidence, do they???

(I also have a Cruzer ‘Fit’ (the 16 GB model)…which runs as cool as a cucumber. Through I would dispute that those tiny ‘cut-outs’ have got very much to do with it…it’s simply due to a much lower transistor count.)

The news about the far higher power-draw is enlightening, too… :dizzy_face: And a printed warning on the packaging that heat production may occur regularly would go a long way to help matters…bearing in mind that high transistor count AND the astonishing performance.

Ah, well. Carry on regardless!

Mike. :wink:

I’m running both the original 128GB Ultra Fit(s) and the new 256GB Ultra Fit(s).  Aside from the typical heat issue, I’m noticing dropped connections, particularly when using USB 3 transfer rates.

I’ve returned two of these for replacement and have RMAs in for another two.

I just found this thread, and while I’ve seen my Ultra Fit getting quite hot in the past, it seemed to work mostly fine nevertheless.

However, having just found it about its torn pin (as I posted in http://forums.sandisk.com/t5/All-SanDisk-USB-Flash-Drives/Ultra-Fit-not-working-is-the-4th-USB-3-0-pin-normal/m-p/366254), I wonder if any of you has a similar issue? I had never noticed it before, so I wonder if it could be related.

Have six of them. Using 16 and 32 GB versions.

Holding three of them in 3.0 slots in my motherboard from 2015 to date of this post. Almost never removing them. They work well.

One is plugged into 3.0 slot in my Monitor. One is in Raspberry Pi 3 B+, one in Car radio.

ALL OF THEM ARE HEATING SO BADLY! But I don’t know if that heating affects performance, except that one in my car.

I only experience problem with that one which is in my car. Only in heat in summer. When air is very hot.

Radio’s USB port is getting so hot and music is stopping playing. Need to plug device out and wait until is cool.

But they are still working fine.

I Googled this topic because I was really confused after all these years of usage.

This is what I can share with you. Cheers :slight_smile:

well you guys been lucky here…i once needed to remove my computer case and remove flash drive cuse it got melted into usb port and got stuck there.used screw driver and brute force to push it out.
got both agter cleaning with 90% alchool what is meant for cleaning for electronics(like thermal paste).