Terrychung17 Author

Level 1

8 points

Sandisk Ultra Flair Flashdrive USB3.0 not recognised in MacBook Air

Hi there I have a MacBook Air 2012 (macOS High Sierra v10.13.6) and a Sandisk Ultra Flair USB3.0. My family member formatted the flash drive a few time in Mac and also in Windows 7 previously. For some reason,s when I plug the flash disk in my MacBook Air or other windows laptop now, nothing shows up. I tried to open disk utility in my MacBook air but still can't find the flash drive. My flash drive is like a brick now=( I just wanted to use it for data storage.

How could I locate this flash drive in my macbook air and then format it again?

Thanks

Posted on Nov 5, 2018 3:01 PM

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6 replies

Level 10

250,379 points

Nov 5, 2018 3:23 PM in response to Terrychung17

Open Terminal, enter or paste the following, then press enter:

diskutil list

If it doesn't show there & other USB things work in tht port, then likely it's dead.

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Level 10

250,379 points

Nov 6, 2018 3:03 AM in response to Terrychung17

I guessed that the 209.7MB disk0s1 is my flash disk?

Sorry, no that is your EFI partition.

It doesn't show there, if other USB things work in tht port, then likely it's dead.

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Terrychung17 Author

Level 1

8 points

Nov 5, 2018 7:49 PM in response to BDAqua

I followed your suggestion.

/dev/disk0 (internal, physical):

#: TYPE NAME SIZE IDENTIFIER

0: GUID_partition_scheme *121.3 GB disk0

1: EFI EFI 209.7 MB disk0s1

2: Apple_APFS Container disk1 121.1 GB disk0s2

/dev/disk1 (synthesized):

#: TYPE NAME SIZE IDENTIFIER

0: APFS Container Scheme - +121.1 GB disk1

Physical Store disk0s2

1: APFS Volume Macintosh HD 104.8 GB disk1s1

2: APFS Volume Preboot 21.0 MB disk1s2

3: APFS Volume Recovery 519.0 MB disk1s3

4: APFS Volume VM 4.3 GB disk1s4

I guessed that the 209.7MB disk0s1 is my flash disk? Please see the question I asked earlier this year.

Re: usb flash drive petition and formatting

How can my MacBook recognise the flash disk as 256gb again? Thanks!

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Level 10

136,499 points

Nov 5, 2018 3:42 PM in response to Terrychung17

Just to add, some people unplug flash drives without ejecting them first. Bad idea.

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Level 10

136,499 points

Nov 5, 2018 8:36 PM in response to Terrychung17

FWIW, the entire listing is your internal drive is the internal drive of the MacBook Air which appears to be 128GB.

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Level 10

136,499 points

Nov 5, 2018 9:17 PM in response to dialabrain

dialabrain wrote:

FWIW, the entire listing is the internal drive of the MacBook Air which appears to be 128GB.

Better.

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Sandisk Ultra Flair Flashdrive USB3.0 not recognised in MacBook Air

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