News Western Digital Has 1TB microSD Card for Surveillance: 16 Years Lifespan

linuxdude

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Sep 1, 2015
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Thirdly, at ~60 MB/s, it will take 5926 days, or over 16 years, to write 512TB of data on this card. The product is covered with a three-year warranty, so its actual capabilities well exceed the warranty.
The 16 years were so unbelievable I had to start my calculator and check for myself: With 60 MB/s I came to a livespan of ~99 days.

Firstly, SD controllers do not support an advanced LDPC-based ECC technology, so memory cards cannot provide the same level of endurance as SSDs.
Says who?
 

fevanson

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Sep 20, 2014
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The 16 years were so unbelievable I had to start my calculator and check for myself: With 60 MB/s I came to a livespan of ~99 days.


Says who?
Here is the simple math 60mb/s * 60 seconds * 60minutes * 24 hours = 5,184,000 MB/1024MB/GB = 5062.5 GB/DAY = 5062.5GB/1024GB/TB = 4.944 TB/Day Write theoretical maximum.

So 512TB/4.944TB/day = 103.55 days theoretical minimum days the sd card will last before replacement.

You have a miscalculation TomsHardware Editor, please fix it.
 
Apr 10, 2020
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512 erase cycles is "real" number for TLC. They probably use same FLASH in SSDs and only thanks to controller it might survive longer.

Big question: does card internally takes care of wear leveling or is it on device?
If on device then using such card in mobile might be problematic.
Something on speed. Shouldn't be read speed higher then write?
 

linuxdude

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Big question: does card internally takes care of wear leveling or is it on device?
If on device then using such card in mobile might be problematic.
All sd cards do wear leveling on the device - SD defines a simple block device, so the device which accesses the card does not have to worry about the internal structure / flash / ...
 

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