Flash fails...but SD card still works???

Using Etcher on Big Sur to copy an .iso of my Raspberry Pi’s RetroPie install. I ran Etcher and got an error that “Flash Failed.” “Unmount failed, invalid drive.”

But when I looked at the SD card, it had a boot partition. And it works fine in my Pi!

Now I’m happy it seems to have worked, but nervous that there’s some lurking error I’m unaware of that will wipe out my back up card.

Here is the info I gleaned from CMD-OPT-I. Any thoughts?

Devices: /dev/disk5
gui.js:42734 Auto blockmapping: true
gui.js:42734 Decompress first: true
gui.js:31760 Flashing 1 device, 0% at 5.20 MB/s (total 5.20 MB/s) eta in 772s with 0 failed devices
gui.js:31760 Flashing 1 device, 0% at 8.30 MB/s (total 8.30 MB/s) eta in 483s with 0 failed devices
gui.js:31760 Flashing 1 device, 0% at 9.90 MB/s (total 9.90 MB/s) eta in 407s with 0 failed devices
[LOTS OF “FLASHING 1 DEVICE” DELETED]
gui.js:31760 Flashing 1 device, 99% at 7.80 MB/s (total 7.80 MB/s) eta in 4s with 0 failed devices
gui.js:31760 Flashing 1 device, 99% at 7.20 MB/s (total 7.20 MB/s) eta in 3s with 0 failed devices
gui.js:31760 Flashing 1 device, 99% at 6.10 MB/s (total 6.10 MB/s) eta in 2s with 0 failed devices
gui.js:31760 Flashing 1 device, 99% at 8.20 MB/s (total 8.20 MB/s) eta in 0s with 0 failed devices
gui.js:31760 Verifying 1 device, 0% at 16.90 MB/s (total 16.90 MB/s) eta in 238s with 0 failed devices
gui.js:31760 Verifying 1 device, 0% at 18.60 MB/s (total 18.60 MB/s) eta in 215s with 0 failed devices
gui.js:31760 Verifying 1 device, 1% at 19.70 MB/s (total 19.70 MB/s) eta in 203s with 0 failed devices
gui.js:31760 Verifying 1 device, 1% at 19.00 MB/s (total 19.00 MB/s) eta in 209s with 0 failed devices
[LOTS OF “VERIFIYING 1 DEVICE” DELETED]
gui.js:31760 Verifying 1 device, 99% at 19.60 MB/s (total 19.60 MB/s) eta in 2s with 0 failed devices
gui.js:31760 Verifying 1 device, 99% at 19.00 MB/s (total 19.00 MB/s) eta in 1s with 0 failed devices
gui.js:31760 Verifying 1 device, 100% at 19.20 MB/s (total 19.20 MB/s) eta in 0s with 0 failed devices
gui.js:42734 Thu Jun 24 2021 21:29:16 GMT-0400 (Eastern Daylight Time) Flash error ({“image”:{“size”:15833497600,“name”:“retropie_backup_062421.iso”,“hasMBR”:true,“partitions”:[{“offset”:4194304,“size”:268435456,“type”:14,“index”:1},{“offset”:272629760,“size”:15560867840,“type”:131,“index”:2}],“extension”:“iso”,“path”:"/PATH/TO/FILE/REDACTED//retropie_backup_062421.iso"},“drives”:[{“size”:15833497600,“isVirtual”:false,“enumerator”:“DiskArbitration”,“logicalBlockSize”:512,“raw”:"/dev/rdisk5",“error”:null,“isReadOnly”:false,“displayName”:"/dev/disk5",“blockSize”:512,“isSCSI”:false,“isRemovable”:true,“device”:"/dev/disk5",“busVersion”:null,“isSystem”:false,“busType”:“USB”,“isCard”:false,“isUSB”:true,“devicePath”:“IODeviceTree:/PCI0@0/XHC1@14”,“mountpoints”:[{“path”:"/Volumes/Untitled",“label”:“Untitled”}],“description”:“Generic STORAGE DEVICE Media”,“isUAS”:null,“partitionTableType”:“mbr”}],“driveCount”:1,“uuid”:“6733d4cc-6c40-486f-9c84-31e581eb0630”,“flashInstanceUuid”:“6733d4cc-6c40-486f-9c84-31e581eb0630”,“error”:{“name”:“Error”,“message”:“Unmount failed, invalid drive”,“stack”:“Error: Unmount failed, invalid drive”},“sample”:0.1,“applicationSessionUuid”:“ab1d1f74-68a4-4403-8aa4-583ea7b81652”,“flashingWorkflowUuid”:“4c256a4b-74d8-4151-98a1-aedc28186b73”})
gui.js:42734 Finish: 4032823296
gui.js:42734 Terminating IPC server
gui.js:42734 Flash results Objectcancelled: falseresults: {bytesWritten: 4032823296, devices: {…}, errors: Array(1), sourceMetadata: {…}, averageFlashingSpeed: 9279924.744865673}skip: false__proto__: Object
gui.js:42734 Thu Jun 24 2021 21:29:16 GMT-0400 (Eastern Daylight Time) Done ({“image”:{“size”:15833497600,“name”:“retropie_backup_062421.iso”,“hasMBR”:true,“partitions”:[{“offset”:4194304,“size”:268435456,“type”:14,“index”:1},{“offset”:272629760,“size”:15560867840,“type”:131,“index”:2}],“extension”:“iso”,“path”:"/PATH/TO/FILE/REDACTED//retropie_backup_062421.iso"},“drives”:[{“size”:15833497600,“isVirtual”:false,“enumerator”:“DiskArbitration”,“logicalBlockSize”:512,“raw”:"/dev/rdisk5",“error”:null,“isReadOnly”:false,“displayName”:"/dev/disk5",“blockSize”:512,“isSCSI”:false,“isRemovable”:true,“device”:"/dev/disk5",“busVersion”:null,“isSystem”:false,“busType”:“USB”,“isCard”:false,“isUSB”:true,“devicePath”:“IODeviceTree:/PCI0@0/XHC1@14”,“mountpoints”:[{“path”:"/Volumes/Untitled",“label”:“Untitled”}],“description”:“Generic STORAGE DEVICE Media”,“isUAS”:null,“partitionTableType”:“mbr”}],“driveCount”:1,“uuid”:“6733d4cc-6c40-486f-9c84-31e581eb0630”,“status”:“finished”,“flashInstanceUuid”:“6733d4cc-6c40-486f-9c84-31e581eb0630”,“errors”:[{“name”:“Error”,“description”:“Generic STORAGE DEVICE Media”,“device”:"/dev/disk5"}],“devices”:{“failed”:1,“successful”:0},“bytesWritten”:4032823296,“sourceMetadata”:{“size”:15833497600,“name”:“retropie_backup_062421.iso”,“blocks”:[{“blocks”:[{“offset”:0,“length”:386924544}]},{“blocks”:[{“offset”:406847488,“length”:810549248}]},{“blocks”:[{“offset”:1218445312,“length”:487587840}]},{“blocks”:[{“offset”:1707081728,“length”:258998272}]},{“blocks”:[{“offset”:1967128576,“length”:1048576}]},{“blocks”:[{“offset”:1969225728,“length”:1048576}]},{“blocks”:[{“offset”:1971322880,“length”:1048576}]},{“blocks”:[{“offset”:1974468608,“length”:4194304}]},{“blocks”:[{“offset”:1980760064,“length”:37748736}]},{“blocks”:[{“offset”:2020605952,“length”:855638016}]},{“blocks”:[{“offset”:2877292544,“length”:1048576}]},{“blocks”:[{“offset”:2879389696,“length”:1048576}]},{“blocks”:[{“offset”:2881486848,“length”:1048576}]},{“blocks”:[{“offset”:2883584000,“length”:1048576}]},{“blocks”:[{“offset”:2885681152,“length”:1048576}]},{“blocks”:[{“offset”:2887778304,“length”:1048576}]},{“blocks”:[{“offset”:2889875456,“length”:1048576}]},{“blocks”:[{“offset”:2891972608,“length”:5242880}]},{“blocks”:[{“offset”:2898264064,“length”:66060288}]},{“blocks”:[{“offset”:2965372928,“length”:1048576}]},{“blocks”:[{“offset”:2967470080,“length”:1048576}]},{“blocks”:[{“offset”:2969567232,“length”:1048576}]},{“blocks”:[{“offset”:2971664384,“length”:26214400}]},{“blocks”:[{“offset”:2998927360,“length”:7340032}]},{“blocks”:[{“offset”:3007315968,“length”:3145728}]},{“blocks”:[{“offset”:3011510272,“length”:1048576}]},{“blocks”:[{“offset”:3013607424,“length”:1048576}]},{“blocks”:[{“offset”:3015704576,“length”:1048576}]},{“blocks”:[{“offset”:3017801728,“length”:1048576}]},{“blocks”:[{“offset”:3019898880,“length”:1048576}]},{“blocks”:[{“offset”:3021996032,“length”:1048576}]},{“blocks”:[{“offset”:3024093184,“length”:34603008}]},{“blocks”:[{“offset”:3059744768,“length”:1048576}]},{“blocks”:[{“offset”:3061841920,“length”:1048576}]},{“blocks”:[{“offset”:3063939072,“length”:1048576}]},{“blocks”:[{“offset”:3066036224,“length”:1048576}]},{“blocks”:[{“offset”:3068133376,“length”:1048576}]},{“blocks”:[{“offset”:3070230528,“length”:1048576}]},{“blocks”:[{“offset”:3072327680,“length”:1048576}]},{“blocks”:[{“offset”:3076521984,“length”:1048576}]},{“blocks”:[{“offset”:3078619136,“length”:1048576}]},{“blocks”:[{“offset”:3080716288,“length”:1048576}]},{“blocks”:[{“offset”:3082813440,“length”:1048576}]},{“blocks”:[{“offset”:3084910592,“length”:1048576}]},{“blocks”:[{“offset”:3087007744,“length”:1048576}]},{“blocks”:[{“offset”:3089104896,“length”:1048576}]},{“blocks”:[{“offset”:3091202048,“length”:122683392}]},{“blocks”:[{“offset”:3214934016,“length”:1048576}]},{“blocks”:[{“offset”:3217031168,“length”:1048576}]},{“blocks”:[{“offset”:3219128320,“length”:1048576}]},{“blocks”:[{“offset”:3223322624,“length”:1048576}]},{“blocks”:[{“offset”:3225419776,“length”:22020096}]},{“blocks”:[{“offset”:3248488448,“length”:1048576}]},{“blocks”:[{“offset”:3250585600,“length”:1048576}]},{“blocks”:[{“offset”:3252682752,“length”:1048576}]},{“blocks”:[{“offset”:3254779904,“length”:1048576}]},{“blocks”:[{“offset”:3256877056,“length”:1048576}]},{“blocks”:[{“offset”:3258974208,“length”:3145728}]},{“blocks”:[{“offset”:3263168512,“length”:1048576}]},{“blocks”:[{“offset”:3265265664,“length”:1048576}]},{“blocks”:[{“offset”:3267362816,“length”:1048576}]},{“blocks”:[{“offset”:3269459968,“length”:3145728}]},{“blocks”:[{“offset”:3273654272,“length”:1048576}]},{“blocks”:[{“offset”:3275751424,“length”:9437184}]},{“blocks”:[{“offset”:3287285760,“length”:2097152}]},{“blocks”:[{“offset”:3290431488,“length”:1048576}]},{“blocks”:[{“offset”:3292528640,“length”:63963136}]},{“blocks”:[{“offset”:3357540352,“length”:1048576}]},{“blocks”:[{“offset”:3361734656,“length”:3145728}]},{“blocks”:[{“offset”:3365928960,“length”:4194304}]},{“blocks”:[{“offset”:3443523584,“length”:31457280}]},{“blocks”:[{“offset”:3485466624,“length”:24117248}]},{“blocks”:[{“offset”:3510632448,“length”:29360128}]},{“blocks”:[{“offset”:3543138304,“length”:9437184}]},{“blocks”:[{“offset”:3553624064,“length”:3145728}]},{“blocks”:[{“offset”:3557818368,“length”:9437184}]},{“blocks”:[{“offset”:3569352704,“length”:23068672}]},{“blocks”:[{“offset”:3594518528,“length”:35651584}]},{“blocks”:[{“offset”:3634364416,“length”:19922944}]},{“blocks”:[{“offset”:3655335936,“length”:6291456}]},{“blocks”:[{“offset”:3686793216,“length”:6291456}]},{“blocks”:[{“offset”:3695181824,“length”:29360128}]},{“blocks”:[{“offset”:3725590528,“length”:1048576}]},{“blocks”:[{“offset”:3727687680,“length”:1048576}]},{“blocks”:[{“offset”:3737124864,“length”:47185920}]},{“blocks”:[{“offset”:3789553664,“length”:22020096}]},{“blocks”:[{“offset”:3812622336,“length”:35651584}]},{“blocks”:[{“offset”:3854565376,“length”:35651584}]},{“blocks”:[{“offset”:3896508416,“length”:2097152}]},{“blocks”:[{“offset”:3901751296,“length”:3145728}]},{“blocks”:[{“offset”:3910139904,“length”:1048576}]},{“blocks”:[{“offset”:3955228672,“length”:75497472}]},{“blocks”:[{“offse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gui.js:42734 Thu Jun 24 2021 21:29:16 GMT-0400 (Eastern Daylight Time) SafeWebview loaded ({“event”:{“id”:119,“url”:“https://www.balena.io/etcher/success-banner/?borderTop=false&darkBackground=true&etcher-version=1.5.116&api-version=2&optOutAnalytics=false",“method”:“GET”,“timestamp”:1624584556732.2842,“resourceType”:“mainFrame”,“ip”:“68.183.29.183”,“fromCache”:false,“statusLine”:"HTTP/1.1 200”,“statusCode”:200,“responseHeaders”:{“age”:[“683295”],“cache-control”:[“public, max-age=0, must-revalidate”],“content-encoding”:[“br”],“content-length”:[“6088”],“content-type”:[“text/html; charset=UTF-8”],“date”:[“Thu, 17 Jun 2021 03:41:01 GMT”],“etag”:["“7f252ae1860b6dd84c58c4e06b3c6e3c-ssl-df”"],“link”:["</webpack-runtime-ce0e6738e6853ac14584.js>; rel=preload; as=script, </styles-c4fa86dfd4ad05097eee.js>; rel=preload; as=script, </framework-42f2600cafd3c0e08aac.js>; rel=preload; as=script, </50c25a04-efe577ee14c9c53bed03.js>; rel=preload; as=script, </73ad3401-e112b47ad7a992b91ac8.js>; rel=preload; as=script, </532a2f07-16f3498dd087ee7288d4.js>; rel=preload; as=script, </app-2470a04451a2471559a3.js>; rel=preload; as=script, </c943faba-f859f80ceb7f4f7eab31.js>; rel=preload; as=script, </af13d906-36fdbc23fc7dd2f2b2e7.js>; rel=preload; as=script, </ec1189df-4ae9e03f4545d4f1d61b.js>; rel=preload; as=script, </a9a7754c-29508ff4045f1f93a5f6.js>; rel=preload; as=script, </commons-8fcc2f56d20b76e33299.js>; rel=preload; as=script, </edad6859a763f5239c0343c48608d154b87713d6-282649cf8ac0a71046b8.js>; rel=preload; as=script, </component—src-pages-etcher-success-banner-js-c81df2b0c3894e1f37af.js>; rel=preload; as=script, </page-data/app-data.json>; rel=preload; as=fetch; crossorigin, </page-data/etcher/success-banner/page-data.json>; rel=preload; as=fetch; crossorigin"],“referrer-policy”:[“strict-origin-when-cross-origin”],“server”:[“Netlify”],“status”:[“200”],“strict-transport-security”:[“max-age=31536000”],“vary”:[“Accept-Encoding”],“x-content-type-options”:[“nosniff”],“x-frame-options”:[“DENY”],“x-nf-request-id”:[“33af6473-6a3a-4dc5-99bb-f463c6364428”],“x-xss-protection”:[“1; mode=block”]},“referrer”:"",“error”:“net::OK”},“sample”:0.1,“applicationSessionUuid”:“ab1d1f74-68a4-4403-8aa4-583ea7b81652”,“flashingWorkflowUuid”:“4c256a4b-74d8-4151-98a1-aedc28186b73”})
gui.js:31760 Verifying 1 device, 100% at 19.20 MB/s (total 19.20 MB/s) eta in 0s with 0 failed devices
gui.js:42734 Thu Jun 24 2021 21:31:33 GMT-0400 (Eastern Daylight Time) Toggle setting ({“setting”:“updatesEnabled”,“value”:true,“sample”:0.1,“applicationSessionUuid”:“ab1d1f74-68a4-4403-8aa4-583ea7b81652”,“flashingWorkflowUuid”:“4c256a4b-74d8-4151-98a1-aedc28186b73”})
gui.js:42734 Thu Jun 24 2021 21:31:35 GMT-0400 (Eastern Daylight Time) Toggle setting ({“setting”:“updatesEnabled”,“value”:false,“sample”:0.1,“applicationSessionUuid”:“ab1d1f74-68a4-4403-8aa4-583ea7b81652”,“flashingWorkflowUuid”:“4c256a4b-74d8-4151-98a1-aedc28186b73”})
gui.js:42734 Thu Jun 24 2021 21:31:36 GMT-0400 (Eastern Daylight Time) Open external link ({“url”:“https://github.com/balena-io/etcher/blob/master/CHANGELOG.md",“sample”:0.1,“applicationSessionUuid”:“ab1d1f74-68a4-4403-8aa4-583ea7b81652”,“flashingWorkflowUuid”:"4c256a4b-74d8-4151-98a1-aedc28186b73”})
gui.js:42734 Thu Jun 24 2021 21:31:54 GMT-0400 (Eastern Daylight Time) Open external link ({“url”:“https://github.com/balena-io/etcher/blob/master/SUPPORT.md",“sample”:0.1,“applicationSessionUuid”:“ab1d1f74-68a4-4403-8aa4-583ea7b81652”,“flashingWorkflowUuid”:"4c256a4b-74d8-4151-98a1-aedc28186b73”})