Software :: USB Flash Drives Not Recognized
Aug 8, 2009
I have a 2008 (2/2008) 24" aluminum imac that is not recognizing certain USB flash drives now. The drive (Sony 8gb) worked before but does not now. When started up with the drive in a USB port, system profiler will find it but disk utilities will not (nor does it appear on my desktop). I have tried all other USB ports in this computer with no results. This drive still works fine on all other macs in the house. This problem is isolated only to flash drives since all other USB accessories still function fine. I recently added a Sandisk imagemate all-in-one card reader to this system and suspect that this might have caused the problem since oddly enough, my Sandisk flash drive still works fine. The only driver I installed with this reader was the application start up button (to launch iphoto).
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May 25, 2009
This just started happening within the past month or so. None of my USB drives are being recognized or mounted. They appear within Disk Utilities and I can verify and run checks on them, but they do not mount. This isn't limited to one device or any specific port. It happens with USB memory sticks, external Maxtor drives (two different ones) and now my Canon PowerShot camera. Basically anything the Mac would mount as an external drive has this issue, so I know it's not specific to any hardware.
I do have a work around that I found on [URL] -- If I reboot with the device plugged in and hold the 'command' key the drive gets mounted. Next time I try the device though (in the case of my camera plugging it into another computer) it's not recognized again. I basically have to do this reboot procedure any time I want to use any device.
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Aug 1, 2010
My G5 PowerPC will not recognize any external drive, on the desktop or Disk Utility. One showed up briefly, but the computer locked up . I've tried each drive on my Imac and they all show up and work perfectly.
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Aug 4, 2010
Last week, my Macbook Pro (13", Mid-2009 model) froze. I held the power button to shut it down, and when I tried to start it back up, it gave me the blinking folder of death. I tried to boot using my Snow Leopard disk to try and repair the disk, but there was no drive except my DVD drive found.
So, I brought it into a local Apple store, and the "geniuses" told me my hard drive had failed and that they could replace it for $300 (I'm 1 month out of warranty, no AppleCare). I declined the offer and bought myself a hard drive off NewEgg for $50 (Western Digital Scorpio Blue 500GB).
I opened the computer up, took out the old hd and put in the new one. I booted to my Snow Leopard disk to install it, and again there was no hard drive found. I tried to go through Disk Utility as well and there was no listed hd.
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May 24, 2012
I have a MacPro 1,1 with a 2 x 2.66GHz Dual-Core Intel Xeon and I just upgraded to OSX Lion 10.7.4. Upon upgrading my system stopped recognizing the two optical drives I had installed. Is there a patch or are there drivers that I can download to fix this? Has this happened to anyone else? I was prepared to lose access to some older software but not my optical drives!!! Â
When I do a "system report" through "About this mac" both of the drives are listed but they dont show up on my deskop. I have an Optiarc DVD RW AD-7170A and a TSSTcorp CDDVDW SH-S202N
Info:
Mac Pro, Mac OS X (10.7.4), 2 x 2.66 GHz Dual-Core Intel Xeon
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May 28, 2012
I am a new MacBookPro user and I really don't know what I am doing . I am having problems with the flash drive. It appears that it is not being recognized.
Info:MacBookPro
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Oct 15, 2009
So I have followed a bunch of the 'MacPro with mac raid card users wanting to do bootcamp' threads. I have attempted all the hacking required but have not been successful. I heard that bootcamp 3.1 will fix this problem possibly... so in the mean time I would like to remove my SAS drives and raid card and just use the sata drives that I have to do Mac OS and Windows.
I have removed the card but when I plug the drives in and boot up the machine, the drives are not recognized. Is there some plug that I need to reconnect somewheres?
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Apr 12, 2012
All of a sudden the other day, my Verbatim USB flash drive just stopped being recognized... it had been mounted, a TM backup made to it when all of a sudden I got an error stating that it had been improperly removed... it was like I had yanked it from the USB port.I tried unplugging it, reconnecting, rebooting, moving it to another computer... no luck. it doesn't even show up in Disk Utility Verbatim has agreed to replace it under warranty but I'm wondering if there's anyway that I can mount it again to retrieve the TM backups.
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Feb 17, 2009
A Verbatim Store 'N' Go 4GB is not even recognised by Mac OSX 10.5.6 when plugged in. Is this to be expected and can the Mac OS be configured to recognice it?
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Dec 7, 2014
After installation of Yosemite, Adobe Flash Player not working, have uninstalled and re-installed several times, but still not recognized.
Info:
MacBook Pro with Retina display, OS X Yosemite (10.10.1)
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Sep 11, 2010
[URL] Though I've never done it myself, I've gleaned that it's possible to partition/raid multiple HDs together to act as 1 HD Might it be possible to do the same to lots of Flash Drives serially linked with USB hubs? 1 USB port -> 1 hub (7 USB ports) -> 7 hubs (49 USB ports) -> 49 hubs (343 USB ports)
USB hubs /can/ be really cheap (given patience, they could probably be acquired for $3 per 7-port hub) If you go to conventions and stuff like that, they literally give away flash drives with the company's info on them. not the largest around, but I've seen 512MB (maybe larger now? that was several years ago) to get 343 ports, you would need 57 hubs ($171) 343 free 512MB flash drives cardboard box 18x18x18" (if each hub is 7x2x1", then 57 would take up 7x19x6") This would be big, but not ungodly so. This would give us 171.5 GB. (343 GB if each drive is 1GB) I'm not sure of the power requirements of these drives - might have to get hubs with own power supplies. anyways - is this possible? would it work how I think? USB 2.0 offers faster data transfer than SSD, but I don't know the speeds of flash drives.
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Nov 12, 2010
I purchased a 16GB PNY Attache and cloned my hard drive before I installed anything on it. My only reason is for backup and to run a few utilities. It seems to be a little leisurely when I boot from it though. Does anybody know if there are faster read and write ones or is this as good as it gets?
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Jun 25, 2008
Can you guys let me know which flash drives work with the macbook air without the need for a dongle?
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Nov 22, 2008
I really don't want a USB flash drive. USB sucks eggs simply because FireWire can do so much more (TDM, transfer speeds, etc.) OCZ was going to make a FireWire flash drive; heck, they had a FireWire 800 version built! Does anyone know of any FireWire flash drives? 800 is certainly preferable, since 400 is currently dead.
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Apr 7, 2009
I just inserted a brand new flash drive into my macbook, a 16 gig sandisk cruzer. I thought the system would ask me to reformat it, but it didn`t. It looks like i can add and delete files without any problem, though. Is it ok to use this same drive to share files between my windows and mac? will there be any kind of format issues or problems? Just asking to be sure I won`t do anything wrong before I pop it in my pc lol
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Nov 29, 2009
BEFORE I started experiencing problems with my HD, a year or so ago, and before it crashed, I made this backup (see "GREY_USB"). At that time, I was using iMovie 06 to produce video DVD's for animations of clients' products and business plans. AFTER my system crashed (and a move to the other side of the planet!), I was finally able to have my Powerbook rebuilt and restored (see 3 attachments beginning "BLACKORANGE".)
Only after getting fully settled here, did I realise iMovie is apparently not installed....at least, not as far as I can tell. Some version of it may be on one of these USB flash drives, but it's been so long since I tinkered with any of this alchemy, I don't remember a flaming thing about how to go about checking. Is it possible to view only, without downloading anything, exactly what applications/data are on BOTH flash drives, then, IF the iMovie dmg is still on one of them, to install it?
I'd prefer not to install iMovie 08 unless that's all I have; the expense of having to fit Final Cut into the budget right now is absolutely out of the question. If you need more details or info, let me know. As my signature indicates: Powerbook G4, Mac OS X 10.4.11 w/Safari 4.04, iLife 08, occasionally running external LaCie HD (well, when I find it and unpack it).
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Jan 8, 2010
I can plug in an external USB keyboard and mouse however I can not mount and USB flash drives or USB external disks. I get the following error message:
kernel Flash Disk : family specific matching fails
I am running OSX 10.5.8 on a 15" Macbook Pro 2.53 Ghz. Apple Care has not be very helpful so far. I've verified/repaired disk permissions with lo luck.
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Nov 12, 2010
I have an aluminum numeric keyboard. and when I plugged in two scandisk Cruzer usbdrives it said that one of them wasn't getting enough power. So I read online and saw that some people said windows can provide enough power for both. So I turn on my virtual windows machine (which automatically mounted the usb drive that was connected) and then my mac was able to mount the second usb drive! But when I let windows try to host both drives in the keyboard windows said it couldn't power both devices either! this may just be because it was a vm.
But my point is at one time I had access to both drives in my keyboard(with one os for each one) but when using just a single one it wont work. Is there any way to change a setting so I can push out more power to my usb keyboard? I'm perfectly fine with terminal and editing files, but is there a setting to change anywhere?(it's only getting 300mA and the usb drives need 200 each and the keyboard itself needs 20 so that all fits in the 500mA range).
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Jun 28, 2012
I'm trying to transfer pictures to my macbook pro from an SD card.Â
Info:
MacBook Pro
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Aug 25, 2014
First the specs from "About this Mac":
MacBook Pro "13-inch, Late 2011", 2.8GHz Intel Core i7 // RAM= 8 GB 1333 MHz DDR3
Mac OS X 10.9.4 "Mavericks" (13E28)Â
The problem:
None of my USB Flash drives are accessible in Finder.Â
The drives do technically "Mount" properly - they show up in Disk Utility, with the "Unmount" & "Eject" buttons available (indicating it's mounted), and they're mounted to the path /Volumes/<Disk Name>. Also, the disks show up in the Finder Sidebar with the correct name etc.
However, If I click on the Finder icon for the drive, the window flashes white for a millisecond and then reverts back to whatever the window showed before (eg. my home folder's contents). Finder will not access them. This has occurred on 3 different USB Flash drives (all of the ones I own!), which are formatted for ye olde windoze, FAT16 or FAT32 (aka. MS-DOS).
The drives operate perfectly normally on an iMac running OS X 10.8.5 (accessible in Finder). I was able to copy files to/from & list the contents of the Flash drives normally.Â
In Disk Util. I can Unmount & re-mount without error. If I unplug the disk I get the expected "This disk was not unmounted properly" banner. Eject via DiskUtil appears to work properly without error, causing the disk to vanish from Disk Utility (as expected).
The directory /Volumes does not show the drive's directory (just "Macintosh HD") - in fact the first time I list /Volumes/ after plugging in a drive, it appears to show some folder in /Volumes that is quickly removed (kind of scrolls-up into itself) as soon as the /Volumes directory is listed - was it my drive playing hide-and-seek??
The Eject button / option (in right-click menu) is not available in the Finder.
If I use Finder > Go To Folder… and type in the "Mount Point" from Disk Utility, I get a "folder not found" error.Â
In DiskUtil, if I right-click the drive name and select Reveal In Finder…, strangely the folder will actually show up in /Volumes, and I can open the folder and view the drive contents (sometimes I have to Reveal it twice for it to work)! I was also able to create a new folder after this (which did show up on the iMac as well). However, if I tried to copy and files to the Flash drive, I get either
The operation can’t be completed because one or more required items can’t be found. (Error code -43)
(when I try to drag a file into the newly created folder on the Flash drive), or
The operation can’t be completed because an unexpected error occurred (error code -8058).
(if I drop a file on the Flash drive's root directory, or try to copy a file form the Flash drive to my computer).Â
I have tried DiskUtil/"Repair Disk" on the flash drives, which doesn't show any errors or warnings (they appear to be ok - again they work fine on another Mac).
I also did a "Repair Permissions" on my MacBook, to no avail.Â
I seem to remember having this same problem on OS X 10.8 at some point last year, and think I solved it via an online hint, but I have yet to re-find that solution (I'm on OS 10.9 now).Â
Info:
MacBook Pro, OS X Mavericks (10.9.4), USB Flash Drives formatted as FAT16
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Nov 7, 2008
I am here because I am interested in buying my first Mac Laptop. I would be mainly using this in my High School during Lunch and Study hall to work on projects and research. My school only uses Apple computers so I don't think there will be a networking problem(heard there can be some unfriendly networks towards macs?). I have been looking into THIS I Book sold used by [URL]it dose not have a airport card (I dont know what that is) and the CD drive doesn't work but that doesn't bother me because I mainly use flash drives and SD cards.
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Jan 9, 2010
I don't understand why after 4 Apple Repair Depot visits my MB Pro is STILL killing several USB FLASH and external hard drives a week. It has consistently done this since the day I bought it. I have fried a large variety of FLASH Memory sizes, shapes, through all USB ports and even through attached hubs. Once my mac does this to a USB device, it is no longer recognizable by any Mac or PC ever again. Unrecognized, it doesn't even leave an opportunity for Disk Utility to reformat, rewrite, perform first aid, verify...nothing. Third-party formatters don't work either. It also doesn't seem to matter what brand, size, or port I use. For a certain period the devices would become very hot and sometime actually melt into puddles of liquid plastic and metal.
On the 4th depot dispatch for this issue they did replace the mother board USB ports and EVERYTHING ELSE but the display hard drive, and case. This stopped the heating and melting problem, but I'm still frying the devices and rendering them unrecognizable. Does anyone have ANY IDEA of what may be causing this? Is there anything I can do to stop or prevent it? Apple sure can't explain it much less fix it. This is a huge EXPENSIVE problem, and I can't seem to get past it, and I'm in an endless loop of sending in in for constant repairs. WHat can be done to stop or prevent this from happening?
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Apr 10, 2012
I use Paragon HFS+ for Windows which allows me to read and write to my HFS formatted drives. It works great for any external hard drive I use but when I use a flash drive it doesn't work. I format both my external hard drives and flash drives the same way, I use Disk Utility, I format them using Mac Extended Journaled and GUID partition scheme. When plugging in my flashdrive, my Windows 7 PC will not mount them. Disk Manager shows 3 partitions: EFI, Fat32 and some empty space. If I format my flash drives using the Master Boot Record partition scheme they work great.
So, here's what I have so far: External hard drives work fine when formatted with the GUID Partition scheme. (Mac extended journaled) Hard drives also show 3 partitions in Windows Disk Manager: EFI, HFS and empty spaceFlashdrives show 3 partitions but oddly enough the second partition shows as FAT32. But is completely unusable in Windows 7 Flash drives have to be formatted using the Master Boot Record partition scheme when formatting them as HFS+ volumes in order to work on Windows 7Windows 7 supports GUID partition schemes.
What is causing my Macbook Pro to treat an external hard drive differently then a flash drive when formatting them? Experience and common sense tells me that it shouldn't matter whether it's a flash drive or spindle drive, both should format the same. Granted, I could simply use exFat or FAT32 on my flash drives for cross platform compatibility however I prefer to use HFS+ when possible.
Info:
MacBook Pro, Mac OS X (10.7.3), 2007 MBP, 2.16Ghz, 3 Gigs of RAM
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Jan 20, 2009
ive googled everywhere for this type of process; whether it be an application or a bunch of scripts that would be able to do this, it didnt help me at all and/or i didnt understand it at all. is there a simple application that will allow me to plug in my usb drive and it will seamlessly sync with the "documents" and "pictures" folders, for example. basically, i want it to act like im syncing my iphone with my computer: how it automatically updates every time i plug in my iphone. also, i want the program to update the old files with newer, updated files, whether it was updated on my computer, or from another computer saved on the usb drive. basically (again), i want my usb flash drive to be exactly verbatim with the personalized selected folders on my macbook pro (with the older files updated with the newly modified files).
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Aug 12, 2009
I have purchased two (from different places) 16Gb Flash drives. Ok they are "no name" but never had probs with the 4GB and 8Gb before like this. When I get to about 4GB of copied items they stop, saying I have "no user access priveledges. Then they won't empty.. or allow anything to trrash. The won't eject, I have to pull them out.. they then will empty. I can then start again.. same thing! I have tried Disk Utility, Formatting, Partitioning, Journaled and non Journald. Each time I get the same pattern. I have tried copying 4gb and more at one time and 1, 2, 3GB at a time. I have tried on two different iMacs 24in Intel and a 20in iMac G5 with the exact same results. Obviously it is the sticks but is there a way round it?
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May 14, 2009
I want to snail mail some stuff on a flash drive, formatted as MS-DOS FAT (using Disk Utility) so both Macs and PCs can read it. Will any old flash drive "just work" on XP/Vista, or do I need to worry about drivers and be careful what brand I choose? I want things to be easy for my client--I don't want "new device" installation and security dialogs all over the place if I can help it! The drive will contain a REALbasic app (a Mac version plus a Windows version) that will run off the drive.
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Sep 13, 2009
I'm looking at the specs page for the MacBook Pro and it reads this...
Your MacBook Pro comes standard with a 5400-rpm Serial ATA hard drive. Choose a hard drive with a faster speed for greater performance. Or you can choose a solid-state drive that offers enhanced durability.
Basically suggesting that the HDD option has a performance advantage over the SSD, but is this the case? I always thought SSDs could read & write quicker because they use solid-state flash memory as opposed to hard disks.
I want to go with the 256GB SSD but I want to know how it ranks in speed.
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Sep 27, 2010
I have a question regarding Time Machine functionality. Here's my situation. I have two hard drives in my Pro: one that operates as a Boot drive, and one for storage. Right now I have Time Machine set up to backup my storage drive, but I was wondering if it was possible to have plug in a second external drive and use it to back up the Boot drive. I searched for a similar thread, but couldn't really find anything. Has anybody successfully done this?
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May 15, 2009
As the title says, can you combine 2 drives to one large without the expensive raid card?
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Jul 8, 2007
I want to create a simple flash movie (I don't yet own or know how to use Adobe Flash). Pretty flowers in the background, inspirational music, passages from the Bible or something fading in an out... you know the schtick. Maybe convert it to a screen saver.
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