Welcome to DCT
@eman006
In the future when you're doing diagnostics it's best to change only one thing at a time even when the steps worked correctly before
Probably didn't matter here but it could be a clue of what the trouble was had been in the card pre-format or the firmware pre-update. While you're waiting for the replacement use "CrystalDiskMark" to check your card speed, as the A129 Pro needs fast write speeds and one slow sector or file can trip it up. This test does take awhile but it's quite comprehensive and effective.
Phil
Thanks for the recommendation. I did perform sequential step-by-step troubleshooting: reformatted the card first - no luck, then updated the FW, again, no luck.
So I'm running a Samsung Pro Endurance 128GB card and got the below results with CrystalDiskMark. Looks like it is achieving its claimed 30 MB/s write speed but not its 100 MB/S read speed. Any feedback on the data below would be appreciated since my knowledge is limited on this subject. Thanks!
------------------------------------------------------------------------------
CrystalDiskMark 7.0.0 x64 (C) 2007-2019 hiyohiyo
Crystal Dew World:
https://crystalmark.info/
------------------------------------------------------------------------------
* MB/s = 1,000,000 bytes/s [SATA/600 = 600,000,000 bytes/s]
* KB = 1000 bytes, KiB = 1024 bytes
[Read]
Sequential 1MiB (Q= 8, T= 1): 39.217 MB/s [ 37.4 IOPS] <209392.86 us>
Sequential 1MiB (Q= 1, T= 1): 38.376 MB/s [ 36.6 IOPS] < 27276.05 us>
Random 4KiB (Q= 32, T=16): 4.738 MB/s [ 1156.7 IOPS] <270764.52 us>
Random 4KiB (Q= 1, T= 1): 4.410 MB/s [ 1076.7 IOPS] < 921.27 us>
[Write]
Sequential 1MiB (Q= 8, T= 1): 29.573 MB/s [ 28.2 IOPS] <273999.32 us>
Sequential 1MiB (Q= 1, T= 1): 29.565 MB/s [ 28.2 IOPS] < 35303.52 us>
Random 4KiB (Q= 32, T=16): 0.479 MB/s [ 116.9 IOPS] <614198.13 us>
Random 4KiB (Q= 1, T= 1): 2.353 MB/s [ 574.5 IOPS] < 1729.14 us>
Profile: Default
Test: 1 GiB (x5) [Interval: 5 sec] <DefaultAffinity=DISABLED>
Date: 2020/03/17 22:15:34
OS: Windows 10 [10.0 Build 18363] (x64)