Fails to recognise flash drive

I recently bought a flash drive of Sandisk Cruzer Pop 32 GB. My iMac fails to recognise it frequently - more than 50%. However it works well with my MBA. The failure is either not to recongise the drive at all or eject it automatically. The failure also leads unable to shut off. I have to force iMac to shut off by pressing the power button and hold untill shutting off. Any suggestion to fix it? Thanks!

On the MBA in System Report or System Profiler>Hardware>USB, see how many mA it's using...
USB High-Speed Bus:
Host Controller Location:    Built In USB
Host Controller Driver:    AppleUSBEHCI
PCI Device ID:    0x00e0
PCI Revision ID:    0x0004
PCI Vendor ID:    0x1033
Bus Number:    0x4b
U3 Cruzer Micro:
Capacity:    14.93 GB
Removable Media:    Yes
Detachable Drive:    Yes
BSD Name:    disk5
Version:    2.00
Bus Power (mA):    500
Speed:    Up to 480 Mb/sec
Manufacturer:    SanDisk
OS9 Drivers:    Yes
Product ID:    0x5406
Serial Number:    07745218FA42EE93
S.M.A.R.T. status:    Not Supported
Vendor ID:    0x0781
Volumes:
Untitled:
Capacity:    14.8 GB
Available:    2.52 GB
Writable:    Yes
File System:    Journaled HFS+
BSD Name:    disk5s10
Mount Point:    /Volumes/Untitled

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[Solved] Failed to format flash drive after recent update(3/6/2013)

Hello,
I'm experiencing failure at formatting my flash drive to ext2,3,4, fat32(or possibly any possible format).
This happens after the recent system update which includes filesystem, I wonder if that's the reason.
So I followed the instructions here : https://www.archlinux.org/news/binaries … ervention/
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Last edited by darrenldl (2013-06-04 14:41:04)

I once had a very odd occurrence that - being an isolated incident - I still don't really understand. But it seemed no matter what I did I could not erase data from a flash drive. I'd dd from /dev/zero, reformat, put it on a different computer, and it'd indeed be empty. But then when I plugged it back in to my computer it showed up as populated with a bunch of files that used to be on it.
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I don't know if it is possible to accidentally format a mount point rather than a device - I would think it should fail, but I can't help but wonder if something like that is going on: when the usb is plugged into your machine, the locally created filesystem is being mounted, but when you plug the usb into another computer, it's obviously not there.
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Hi everyone,
I am repeating this request in the hopes that the daytime crowd will have someone who can help!
I plug a usb flashdrive into my MacBook with iTunes active.
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Hello Limnos,
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Hi kelsey,
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Hi. First time post. Nice to be here.
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Hi nina,
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m.com

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A few things to check:
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This question was solved.
View Solution.

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Please find the weblink given below might help you to fix the issue.
USB Device Troubleshooting
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USB Flash Drive wont restore

Hi All
After some help please
I have a 32gb Toshiba pen drive , which i was copying new files onto and the mac came up with the error " Disk has been ejected" , so i pulled the drive out of the usb slot as i couldnt see it in my finder.
When i try and use it my iMac wont recognise it at all , however when i launch Disk Ultility it appears, but the lower section of the drive in the menu side is all greyed out and when i try and erase it or verify/repair it etc i get the following error :
Filesystem formatter failed
unable to write to last block of device.
Any ideas
Many Thanks in Advance

It sounds to me like you have a defective flash drive. About all you can do is toss it in the trash and get a new one.
Regards.

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Mac OS X has a built-in disk diagnostic and repair program called fsck or file system consistency check. Here’s how to verify and repair your startup disk with fsck. As soon as you hear the startup tone, press and hold Command-S on the keyboard. Keep holding down those keys until you see a black screen with white lettering. This is called “booting into Single User Mode.” As the Mac boots in this mode, the screen reports each step of the process. The line should end in root#. Right after the root# prompt, enter the following: /sbin/fsck -fy
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Can I create MacOS on flash drive to run broken Imac?

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It occurred to me that I could maybe install the Snow Leopard software into a flash drive and run the computer off of it, accessing the data and software on the MacIntosh HD via the flash drive, and at least being able to salvage important files that way. I'll need at least a 16 Gig flahs drive for that, no biggie, but my question is: is this feasible or some mad fantasy I've created out of an absurd desire not to get my wallet hijacked by Apple?

I think you'll find that your Hard Drive is failing, I hope you have some form of backup.
Your idea of creating a bootable flash drive could work but it will be useless if your HDD fails which according to your SMART status could happen soon.
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How to Create a Bootable Flash Drive to do a clean install of Lion. I have tried to use the InstallESD.dmg but it still will not do a clean install so that I do not have to do a reinstall from the Recovery (That just re downloads and takes over 6 hours)?
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PS: There is no way that I'm going to buy a Install USB from Apple... They have over billed me over $300.00 because the Apps Store still has bugs (Glad I did not write that App/Service)
If there is anyone that can give in the information to create a USB install stick, I would be very thinkful.

Here you are bro, courtesy of "softpedia.com"....brilliant site!!!
If you ever had problems with your Mac OS X installation you know that the first thing you should do is to check the startup volume using Disk Utility.
After the check has ended and, if the errors exceed a certain level of seriousness, the Disk Utility application will require you to restart your Mac and use its Mac OS X Install disc counterpart.
Other users may have to reinstall OS X altogether, but will find, or already know, that their SuperDrive (a CD/DVD reader and write combo drive) is not functioning properly and it will not be able to read the Install disc.
Although this might happen to Mac OS X Leopard users due to faultyhardware, the vast majority of problematic SuperDrives will be encountered inside Snow Leopard running Macs.
This is due to the updated SuperDrive firmware included in either the Install disc or the software updates one has to install to reach the latest version of OS X, namely 10.6.6.
This can be fixed by flashing the SuperDrive’s stock firmware using free command line tools that one can find for free online (I will write about this process also, but at a later time because this article only focuses on allowing you to create your own alternative USB boot disc).
If you are reading this last bit of information with skepticism, than you should know that it happened to me too. Despite all my tries to make it work properly, the SuperDrive kept on munching any inserted DVDs and just popped them out in about twenty seconds.
The workaround to this issue was to create my own Leopard bootable USB memory stick. I am not suggesting a Snow Leopard bootable stick mainly because there are lots of users that have decided to buy the cheaper, Upgrade version, which I have not tested and, therefore, I’m not sure if it will work properly once written to a USB disk.
And now, here are the exact steps you should follow in order to obtain a fully bootable Leopard (or Lion) Install disc.
Step 1 (If you already have the Leopard install disc DMG file you can skip to Step 2)
Launch Disk Utility (you can find it inside /Applications/Utilities). Here select the Leopard Install disc in the list of drives on the left and click on the New Image menu entry at the top of the window. A save message will appear where you will have to select the Desktop as a destination.
Step 2
After Disk Utility has finished creating the Leopard DMG, insert your USB stick and erase all data and reformat the disk. To do this select the USB in the list of drives on the left and, after clicking on the Erase tab on the right side of the window, choose the Mac OS Extended (Journaled) format and click the Erase button beneath.
Step 3
After the USB has been reformatted, download the SuperDuper app from HERE and launch it. Once SuperDuper starts, you will only have to select the DMG in the Copy drop-down menu, your USB memory stick on the right and hit the “Copy Now” button.
One can also use Disk Utility for this task but creating a bootable USB stick failed 2 out 4 times when copying the DMG to the stick (with the exact same settings each time). Creating the bootable stick using SuperDuper proved to be the perfect way to do it because it worked each of the 4 times I tested it.
The steps above can also be used to create a bootable Mac OS X Lion USB by using the InstallESD.dmg image you can find inside the Lion installer (named “Install Mac OS X Lion.app”) downloaded from the Mac App Store in the /Applications folder.
To locate the InstallESD.dmg right click the Lion installer, select the “Show Package Contents” entry, go inside the “Contents” folder, and from there into the “SharedSupport” folder. Inside this folder you can find the InstallESD.dmg you can use to create your own bootable Mac OS X Lion USB stick. To do so, go to the third step described above and use the InstallESD.dmg as the DMG to be copied to your USB disc.
That’s it! Once the process ends you will have a fully bootable Leopard (or Lion) USB disk that you can use as an alternative to the Apple’s DVD Install disc that comes bundled with all Macs.
To use your newly created bootable disk you will have to restart the Mac, press and hold the OPTION key until the StartupManager appears. Here, select the Mac OS X Install disk using your keyboard arrows and press return to start from the selected drive.

Flash Drive No Longer Recognized

I purchased a new PNY Turbo 3.0 128 GB Flash Drive, formatted it as Mac OSX Journaled, transferred files to it, encrypted it, used it for about 30 minutes on my iMac, then it disappeared while navigating in Finder.
The flash drive does not show in Finder, Disk Utilities, or System Information. Yes, show external drives is checked in Finder Preferences.
The USB is recognized in an older Macbook using a much older OS, although I can't view the contents and a message on the Macbook says that I need to put the drive into a device with an updated Mac OS.
No other user accounts on my iMac can view the flash drive.
So far I have done numerous restarts, shutdowns, and remounts, reinstalled Mavericks (again), repaired disk permissions, etc.
This is the second issue I've had with an Apple formatted and encryped flash drive disappearing. I've put an entire Sunday afternoon reading through threads and troublshooting this, and looks like some people just accept it as another thing that doesn't work on their Mac or go try different brands of flash drives until one works.
Suggestions or recommendations anyone? I would like to keep this flash drive (it does have the Mac symbol on the packaging) if possible.

Did you ever get a satisfactory response to this?
I too have just encountered this issue. I have a PNY USB 3.0 128MB flash drive. I used it successfully for several months.
Today, connecting it to a brand new Mac Mini, 10.10, it is not recognized. It's not just that it isn't recognized... It's not even showing up in Disk Utility. The only indication I have that the system has detected it is this log message:
2014-10-26 12:20:55.000 PM kernel[0]: USBMSC Identifier (non-unique): 09031000003796153712 0x154b 0xfa05 0x1075, 2
Also, it shows up in System Information, in the USB Device Tree, but nowhere else.
I then tried it in my Retina MB Pro (2.3GHz i7) running 10.9.5, where I had always successfully used it, with the exact same results.
It appears that the OS is failing to load the driver, or perhaps something in the USB negotiation is failing.
I tried it on a couple of Macs, running 10.9.5, both USB2.0 and USB3.0, with no luck. My old Snow Leopard 2005 iMac recognized it, but the filesystem was too new for it to read it. (It is an encrypted USB volume). I was, however, able to copy the raw disk image, even though that mac couldn't read it. I am hoping to access the files that way.
Now... I just put the USB Key into another of my Macbook Pros, an old 2.33GHz Core2Duo running 10.7.5, and this machine was able to access the encrypted partition with no problems at all.
So, I conclude that this is some problem related to 10.9.x, since both USB2.0 and USB3.0 Mac's running 10.9 were unable to recognize the disk, yet a 10.7.5 machine with USB2.0 reads this disk fine.
I'm hoping to get a suggestion from someone on how to best go about finding the root cause of this issue...
Thanks,
Pat

Fails to recognise flash drive

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