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USB Too Slow -TeslaCam

El0n

Member
Sep 21, 2019
76
70
Mars
I’ve searched and read all the posts regarding the USB drives and the “too slow” message. I read the entire sticky thread. I can’t seem to find any consensus so I thought I’d ask here.

I bought a brand new, non-counterfeit, Samsung Fit Plus 128GB from Amazon. It was working perfectly for a week or two.

All of a sudden I am now getting the “dreaded” USB too slow error message.

I’ve tried it all - reformatting, restarting the car, etc, etc. but nothing is working.

Did the USB really max out it’s lifespan in a few weeks? Anything you recommend?

This USB drive is rated for well beyond the 4 MB/s requirement.
 

Knightshade

Well-Known Member
Jul 31, 2017
11,550
15,508
NC
Assuming non-defective HW it's a software problem. A pretty common one these days unfortunately, and without much of a solution besides waiting for Tesla to write less crap code.

That drive should be good for longer than the average person owns a car at the relatively small rate a Tesla writes to it, and as you note it's a ton faster than required.
 

Akikiki

A'-Lo-HA ! y'all
Nov 26, 2012
6,381
4,492
Kaneohe, HI
It also could be the 4th stream. From a recent update, the firmware is not sending 4 streams to the USB drive. Added the rear camera.
 

astrowunder

Member
Oct 5, 2018
461
429
Wisconsin
I've been using a Sandisk USB drive for more than 6 months. I did get 'the message' recently, but I just unplugged it, restarted the car and plugged it back in and I've been fine for a couple of weeks now. YMMV.
 

RC2785

Member
Dec 27, 2018
260
177
Chicago
Sep 24, 2014
208
123
Durham, NC
It’s not a software bug.
The Samsung fit plus USB drives are garbage - they are not designed for high – usage security cam applications. Whoever recommended them on this forum should have to drive a Leaf for two weeks.

Our Samsung USB drive failed after a couple months. I thought it was a software bug, because it happened right after a software update. I tried transferring a large file to it from my computer, and it choked. Turns out the Tesla error message was correct – it was too slow!

I purchased a high – endurance microSD card and USB adapter. It has worked perfectly so far. Fingers crossed. (I don’t want to drive the Leaf ;)
 

Need

Active Member
Nov 22, 2017
2,894
2,206
SoCal
Both of our cars are using cheap $5 kingston 16GB drives since dashcam was available. Both are still running great with sentry mode frequently used and no "too slow" messages. With sentry mode overwriting old files, 16GB is big enough for me.
 
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jasazick

Member
Aug 28, 2019
25
17
Illinois
Both of our cars are using cheap $5 kingston 16GB drives since dashcam was available. Both are still running great with sentry mode frequently used and no "too slow" messages. With sentry mode overwriting old files, 16GB is big enough for me.

Yeah, I was using a Raspberry Pi Zero W up until v10, where it promptly started throwing "usb too slow" errors constantly. I switched to a pair of 32gb freebie Western Digital branded flash drives (came free with the purchase of a full size drive a few months ago). I just rotate them in and out, using a laptop in my garage to shuttle footage to my NAS. Wrote some messy powershell that automates it - just pop in the drive, put the other drive in the car, and walk away. So far, no errors.
 
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HighZ

MDNT SLV M3
Apr 30, 2019
189
198
Rockford, IL
I have been using the Sandisk Connect Wireless USB stick for six months, and just started getting this error in the last few days. I have unplugged/plugged back in to get it to work. Seemed to be OK for a day or two, but then it is going into error almost right away.

I understand the 4th stream could be causing a write speed issue, but it is strange it is just happening now after working fine since I upgraded to V10. I will change to a faster MicroSD card for now, but I am guessing that there is a software issue that will be fixed.
 

Knightshade

Well-Known Member
Jul 31, 2017
11,550
15,508
NC
It’s not a software bug.
The Samsung fit plus USB drives are garbage - they are not designed for high – usage security cam applications.


Total nonsense.

For one- the Teslacam isn't a high-usage security camera.

It's writing 720p video as a much lower rate than the actual modern 4k high-use security dashcams are.

In normal usage (8-10 hours a day) it'd take 5-10 years to burn through the rated write-cycles on a 128GB USB key (any brand) with how little data Tesla is writing to it.

It's absolutely a software bug- because many folks with exactly the same HW are having totally different results.

Folks with SSDs, SDCards, and USB keys- even the same ones as each other- some have the issue- some don't- and even among those who have it there's a lot of variability in how it presents.

A problem that runs across all types of HW, and starts happening after a software update to previously just-fine hardware, is a software problem.




It also could be the 4th stream. From a recent update, the firmware is not sending 4 streams to the USB drive. Added the rear camera.

Except folks were getting "too slow" even before they added the 4th camera. In fact for some folks the problem was "fixed" with V10- for others it suddenly appears with V10... for still others it only appeared a little while after V10.

And the 4th camera only increases the write speed from 1.5 MB/s to 2 MB/s- still much slower than even the slowest sustained write speed of USB keys.

Here's a review of the Samsung BAR plus for example-
https://www.storagereview.com/node/7097

Sequential write speeds measured as 61.84MB/s- random 2MB writes as 56.01MB/s (granted this is on a USB3 bus and the car is USB2, but it shows the actual key can easily by a factor of more than 25x handle the speed the car needs.



It's a software problem.

There's a lot of things the problem could be- crap USB controller code, crap handling of the video files between computer, cache, and storage, crap error checking, etc...

What we can be sure of- given even folks with HW many many times faster than needed also have the issue (while others with measurably slower devices don't) is that it's not a HW problem.
 

BZM3

Member
Aug 15, 2019
281
124
Somewhere
I’ve searched and read all the posts regarding the USB drives and the “too slow” message. I read the entire sticky thread. I can’t seem to find any consensus so I thought I’d ask here.

I bought a brand new, non-counterfeit, Samsung Fit Plus 128GB from Amazon. It was working perfectly for a week or two.

All of a sudden I am now getting the “dreaded” USB too slow error message.

I’ve tried it all - reformatting, restarting the car, etc, etc. but nothing is working.

Did the USB really max out it’s lifespan in a few weeks? Anything you recommend?

This USB drive is rated for well beyond the 4 MB/s requirement.
Apparently SSD is the only option.
 

tvad

Member
Jun 30, 2019
979
972
California
Total nonsense.

For one- the Teslacam isn't a high-usage security camera.

It's writing 720p video as a much lower rate than the actual modern 4k high-use security dashcams are.

In normal usage (8-10 hours a day) it'd take 5-10 years to burn through the rated write-cycles on a 128GB USB key (any brand) with how little data Tesla is writing to it.

It's absolutely a software bug- because many folks with exactly the same HW are having totally different results.

Folks with SSDs, SDCards, and USB keys- even the same ones as each other- some have the issue- some don't- and even among those who have it there's a lot of variability in how it presents.

A problem that runs across all types of HW, and starts happening after a software update to previously just-fine hardware, is a software problem.






Except folks were getting "too slow" even before they added the 4th camera. In fact for some folks the problem was "fixed" with V10- for others it suddenly appears with V10... for still others it only appeared a little while after V10.

And the 4th camera only increases the write speed from 1.5 MB/s to 2 MB/s- still much slower than even the slowest sustained write speed of USB keys.

Here's a review of the Samsung BAR plus for example-
https://www.storagereview.com/node/7097

Sequential write speeds measured as 61.84MB/s- random 2MB writes as 56.01MB/s (granted this is on a USB3 bus and the car is USB2, but it shows the actual key can easily by a factor of more than 25x handle the speed the car needs.



It's a software problem.

There's a lot of things the problem could be- crap USB controller code, crap handling of the video files between computer, cache, and storage, crap error checking, etc...

What we can be sure of- given even folks with HW many many times faster than needed also have the issue (while others with measurably slower devices don't) is that it's not a HW problem.
Careful. Facts get in the way of beliefs. ;)
 

kwest2

Member
Apr 28, 2017
254
252
Boston, MA
My 256GB Samsung Bar Plus was fine for perhaps a month or 2, and just last week started getting the too slow error. Unplugging/replugging it generally solves it for a day or 2, but then the error comes back consistently. Sigh.
 

Need

Active Member
Nov 22, 2017
2,894
2,206
SoCal
I feel like "drive too slow" is really a "drive too big" error. It seems that most people getting the error has a drive bigger than 32GB. It think it started before V10. Maybe the software was changed to scan/fix/clear or whatever to the entire drive partition from time to time and if you drive is too big.. it took too long. Just a guess. But I am pretty sure it is not the drive is too slow.
 

moshee

Member
Mar 17, 2019
31
13
Seattle Eastside
Since switching from a Samsung Bar Plus 256GB to a Sandisk Extreme Pro 128GB a month ago, I have had zero issues with the "too slow" message. Several other people have reported success with this model as well. From what I understand, the Extreme Pro uses an SSD controller rather than a typical USB flash mass storage controller, and I've benched it to be significantly faster (5X or so) in write speed than the Samsung using Crystal Disk Mark. The Samsung could barely reach 2-4 MB/s in sequential read, regardless of filesystem (FAT32 or ext3/4). Maybe Windows is to blame for some of that, but the results appear to correlate. I'm thinking the upgraded controller is more suited for continuous/multithreaded writes, whereas USB flash is normally optimized for high sequential read speed. If you actually put the drives into CDM, you may find that they do not nearly live up to their write speed specs in a sustained manner, which I suspect will only get worse with multiple files being written concurrently.
 
Last edited:

wbhokie

Member
Sep 7, 2016
704
433
Woodbridge, VA
I feel like "drive too slow" is really a "drive too big" error. It seems that most people getting the error has a drive bigger than 32GB. It think it started before V10. Maybe the software was changed to scan/fix/clear or whatever to the entire drive partition from time to time and if you drive is too big.. it took too long. Just a guess. But I am pretty sure it is not the drive is too slow.

I think this is part of it. I was using a thumb drive (greater than 32 gb) and when I would get the message simply rebooting the OS while driving would fix the issue short term for me... (I'm assuming when it got back to that state) eventually it would happen again. No issues since switching to a microSD card though.

Still, we have a lot of threads for this already.
 

Knightshade

Well-Known Member
Jul 31, 2017
11,550
15,508
NC
. The Samsung could barely reach 2-4 MB/s in sequential read, regardless of filesystem (FAT32 or ext3/4)...

You got a defective key. Sequential read speeds should be in the hundreds of MB/s for that device.

If you actually put the drives into CDM, you may find that they do not nearly live up to their write speed specs in a sustained manner, which I suspect will only get worse with multiple files being written concurrently.

Again your HW was factory defective.

On a properly working one CDM shows that Samsung key writing at 12-13 MB/s even for tiny random writes (the slowest type)...and up to 60 MB/s sequental. And much faster for reads.

See CDM benchmarks here-
Samsung Bar Plus 256GB Flash Drive Review

Meanwhile the Tesla is writing video at... 2 MB/s. More than 6 times slower than the SLOWEST speeds tested on the Samsung key.

It's massively faster than the car needs.
 

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