I have no idea where you're getting your fuzzy math from
Nothing fuzzy involved, it's pretty simple math.
I
. Doubling the size of the drive doesn't double the number of write operations!
Of course it does.
Flash is rated for a total number of write cycles.
That effectively becomes the number of times the
entire drive can be written to since wear leveling insures writes are done to all blocks to wear the cells evenly
So if a 32GB drive is rated for 3000 cycles (common for the most common decent cheap flash) that's 3000 times you can write 32GB to the drive.
So the total amount of rated writes is 96,000 GB.
Make it a 64GB drive and it's now exactly double the amount of data for the same 3000 cycles.
First of all, USB flash drives are good for between 10K and 100K write/delete operations, depending on the technology used.
This is true if you're posting from like 2005 and paying thousands of bucks for large amounts of enterprise grade flash.
Today? Not so much.
QLC, the most common cheapest type of flash, for example is usually only rated for 1000 cycles.
TLC, the most common used on decent/mainstream USB flash drives, is only 3000-5000 cycles.
Even 10k is crazy higher than nearly anything on the consumer market except the most expensive SSDs using MLC.
100k cycles is crazy expensive enterprise class stuff nobody is using in their Tesla with SLC flash.
Are you under the impression that the dash cam is one continuous write for the duration of the drive, so it only counts as 1 write operation?
Are
you under the impression writing ONE block on the drive uses an entire drive write cycle?
Because it doesn't.
Again,
each cell is rated for that number of writes- and wear leveling insures writes are spread evenly.
So the
entire capacity of the drive is one write
cycle if you write to each cell once, even though that involves many many write
operations
Dashcam and sentry videos are 55-58 seconds a piece with 4 inputs (front, left, right, back). Each one is written to a separate file. So that is 4 distinct write operations per minute or 240 writes per hour.
Write operations- yes.
Drive write cycles? No. Because that's only using ~7.2 GB of the blocks on say a 128GB drive.
You'd need to write for a little under 18 hours straight to use
one entire drive write cycle assuming even wear leveling of the cells.
Every time sentry detects movement and records, it does so for ~1 minute, from 4 cameras, each into a separate file.
Nope.
Sentry doesn't "record" anything.
It's always the dashcam. Which simply keeps running when Sentry mode is engaged.
The only thing Sentry does is, when it goes to alert mode, it moves (NOT copies- those are very different from a drive wear perspective) the last 10 minutes of dashcam from recent to saved.
If Sentry didn't start recording until it went to alert it'd be impossible for it to have the previous 10 minutes of footage after all.
Unless you think the car can time travel....
Again that's 4 write operations per sentry event. So let's take the maximum of 100K writes/deletes
That would be dumb since nobody is running expensive enterprise-class SSDs in their car.
1000 on the low end, 3-5k on the high end, for mainstream consumer flash in the current market.
I can deluge you with sources from flash memory makers if you'd actually be willing to admit your error- but you don't seem the type.
Thus the rest of your math is totally nonsensical (even more because you think writing a single 1 minute file uses up an entire write cycle for the whole drive)
've only been a software engineer for the past 20 years, dealing with microcontrollers, pics, a plc's, and their internal flash memory!!!
That's a frightening and very hard to believe claim unless you retired 15 years ago or something.
It'd explain why your info is so grossly wrong and out of date.