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Last week I flashed Raspbian Buster image to a very old SanDisk 8gb card (slow) using win32diskimager on windows 10, it worked just fine on my new RPI4B-1GB board - and its still functional ...

Steps followed : 1) format SD card on windows as a FAT32 volume 2) flash 2019-07-10-raspbian-buster.img via win32diskimager

This 8gb card boots just fine in the new RPI-4B and older RPI-3B+.

I am now following the same procedure with the exact same Buster image (week-old and downloaded fresh) on 3 Sandisk 16GB ultra SDHC 1 cards for more disk space and none of them boot either in the new RPI-4B nor the older RPI-3B+ boards.

On the old RPI-3B+ - just the red power led stays on - no activity on green led - no hdmi output. On the new RPI-4B - as the red power led stays on the green led starts flashing 4 times periodically - no hdmi output.

All the 4 cards had old RPI3 images ( they mounted 2 partitions - boot and root when connected to the usb ports on windows 10 laptop). While the first format+flashing of 8gb card was successful right away, the other 16gb have been FAT32-formatted and buster-image-flashed multiple times.

Also 1) The cards are not corrupt. 2) I can format all of them to NTFS and access their full capacity that way 3) they all had bootable ubuntu-mate RPI 3B+ images on them earlier.

while I strongly suspect its a boot-sector corruption/alignment issue, I am totally stumped on this inexplicable issue...

what could be causing the problem here ? what else can I try?

thanks

sith
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1 Answers1

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I found a new recommended imager Etcher recommended by @HawaiianPi in this SD Cards issues thread.

Etcher was able to image all the 3 cards without any hiccups and all 3 cards are booting in pi4 now.

Win32DiskImager still doesnt work for me on the Buster image on the 16gb cards.

Also etcher detected all the sd cards as having around 15.5 GB while both Windows format util and sdformatter4 always detected the capacity to be around 14.4 GB. [UPDATED: I guess this is not an issue as per goldilocks below]

This SD Cards issues thread also says

Etcher is the preferred copier now as the win one is OLD

and

Note: that Win32diskimager does NOT do any image or write validation. When you write a card with Win32diskimager you really don't know if the resulting card is good or bad (even if it boots, it could have problems elsewhere). For example, Win32diskimager will happily write images to fake cards with less capacity than the image file. The write will complete without error, but all files above the real capacity will be corrupt.

sith
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