• Effective immediately we will be deleting, without notice, any negative threads or posts that deal with the use of encryption and streaming of scanner audio.

    We've noticed a huge increase in rants and negative posts that revolve around agencies going to encryption due to the broadcasting of scanner audio on the internet. It's now worn out and continues to be the same recycled rants. These rants hijack the threads and derail the conversation. They no longer have a place anywhere on this forum other than in the designated threads in the Rants forum in the Tavern.

    If you violate these guidelines your post will be deleted without notice and an infraction will be issued. We are not against discussion of this issue. You just need to do it in the right place. For example:
    https://forums.radioreference.com/rants/224104-official-thread-live-audio-feeds-scanners-wait-encryption.html

BCD536HP: Reliability issues with memory cards?

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iMONITOR

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#1
I jumped on both the BCD436HP, and 536HP when they were first introduced. Myself and numerous others were experiencing a lot of reliability problems with both scanners and their Micro SD, and SD memory cards. Has that been resolved, and are they no longer a problem? Back then some were suggesting different brands, sizes, speeds, etc. None of that with the exception of the size should have made a difference, which leads me to believe the issue was the scanners, and not the memory cards. Those of you that own current generations of these scanners, can you give some feedback?
 

troymail

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#3
We do know that Uniden changed the SD cards they use quite a while into production of these units... As far as I know, I'm currently using one of those recommended cards in my 536 but it didn't solve my biggest card issue which is the crash/reboot of the radio once it has roughly 35,000 recordings (+/-) on it. The radio still crashed/rebooted upon first use and reaching that amount of recordings. It's a total waste of your money to buy large cards (> 4-8 Gb) for these radios.

The other thing I think Uniden did sometime after the initial release was provide an option to totally disable recording. That probably helped.

Beyond that, even with careful use, these cards will fail over time - apparently even more so if you regularly remove the cards to copy recordings to the PC like I do.

Found the thread:
https://forums.radioreference.com/uniden-tech-support/340206-replacement-sd-cards.html

Uniden even went smaller on these replacement cards after an earlier "unadvertised change to 8GB"... they now ship (or did in 9/2016 per Paul) with 4Gb cards.
 
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#4
It's a total waste of your money to buy large cards (> 4-8 Gb) for these radios.
Not true. The wear-leveling algorithms in flash controllers spread out writes roughly equally among free sectors, so if you double the card size, you're at least doubling free space, which at least doubles the total number of sector writes before the card fails. The only caveat is that the scanner will not support cards larger than 32GB. If you want the greatest possible card life, get a 32GB "high endurance" card (which allow a greater number of writes per sector before failure).
 

phask

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#5
I have 2 HP1 - one was one of the first sold by a major vendor, one HP2 same, and a 536, luckily I've never had a card issue...yet.

I have had them spontaneously die in phones, had USB jumpdrives fail as well.

I have several in Pro cameras and never failed either.
 

troymail

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#6
Not true. The wear-leveling algorithms in flash controllers spread out writes roughly equally among free sectors, so if you double the card size, you're at least doubling free space, which at least doubles the total number of sector writes before the card fails. The only caveat is that the scanner will not support cards larger than 32GB. If you want the greatest possible card life, get a 32GB "high endurance" card (which allow a greater number of writes per sector before failure).
Nothing ever seems to be true to you - whatever.

There is "theory" and then then is reality - which are almost never the same.
 
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#7
Your snark doesn't change the fact that I'm right, which is something something you can verify with a bit of google searching.

https://en.wikipedia.org/wiki/Wear_leveling

https://www.datalight.com/solutions/technologies/wear-leveling

What is wear leveling? - Definition from WhatIs.com

https://www.micron.com/~/media/docu...note/nand-flash/tn2942_nand_wear_leveling.pdf

How Controllers Maximize SSD Life – Better Wear Leveling | The SSD Guy

There is plenty of information on the subject if you bother to look. I recommend you do so; you might learn something.
 

troymail

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#8
Your snark doesn't change the fact that I'm right, which is something something you can verify with a bit of google searching.

https://en.wikipedia.org/wiki/Wear_leveling

https://www.datalight.com/solutions/technologies/wear-leveling

What is wear leveling? - Definition from WhatIs.com

https://www.micron.com/~/media/docu...note/nand-flash/tn2942_nand_wear_leveling.pdf

How Controllers Maximize SSD Life – Better Wear Leveling | The SSD Guy

There is plenty of information on the subject if you bother to look. I recommend you do so; you might learn something.
You just think you are right (all the time). You're not. You spend more time slamming people than you do helping. Give it a rest.

"It's on the Internet so it must be true."
 
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#9
I never said I'm right all the time. But in this case, definitely. You can choose to believe what you want, but reality doesn't care.
 

DaveNF2G

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#12
Don't argue with trolls or professional hair-splitters.

It appears from my chair that a lot of the "reliability" problems for SD cards in portable scanners is a design issue in the scanner. It is easy to bump the card out of position when changing batteries. The card is still fine, but the scanner can't read it properly. Removing and reinserting the SD card usually clears up that particular problem.

There have, of course, been other SD card issues. I have not yet had one last past the first time it got filled up in any dash cam. However, since replacing the cards did not return the dash cams to usability, I have to think the problem is not the SD cards. Slightly OT, perhaps, but apparent SD card issues seem to have many sources.
 
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