816      iPhone_iPad_Mac_apple

USB drives not showing in finder

Hi I have tried a number of different brand USB drives but none show in finder.  I have check in the profiler and they show there.  I have a Macbook Pro running 10.6.x. I am relatively new to Macs so all constructive suggestions welcome.

J

Snap4u wrote:

 

I have tried a number of different brand USB drives but none show in finder.

Finder > Preferences > General > Show these items on the desktop

Is "External disks" checked?

Finder > Preferences > Sidebar > DEVICES

Is "External disks" checked?

Thanks for responding so promptly      Yes this box is checked.

What MacBook?

Are you connecting directly to the MBP, or through a hub?

Do they show in Disk Utility?

Are these drives low capacity thumb drives (eg, 4GB) or high capacity (eg, 500GB)?

These drives are plugged in directly.  I have a choice of two ports.  When I plug in the activity light goes then stops.  I have only tried 4gb or smaller.

Do they show in Disk Utility?

Are you using a USB powered drive? In other words the USB drive does not have a external AC power adapter?

This is a ongoing problem. Some, really most, notebooks, whether Mac or PC, do not put out enough power on the USB ports to power these type of drives. Some work but some, most, don't.

You can buy a USB Y cable that connects to 2 USB ports at the same time giving the drive more power.

Other then that if the drive is listed in Disk Utility you may need to partition and format it before the drive will show in Finder.

But to my knowledge most of these external drive come formatted in one way or another so that any operating system, Mac or Windows, can see them as soon as they are connected.

HI, I have specifically bought usb drives that are supposedly formated for both Mac (10.6.X) and PC.  My feeling is that it must be a setting or something.  I have windows loaded on the same machine and run parallels6 and the drive show up know problem so I don't think it is a power issue.  I just really want to be able to plug it in with the Mac software running only.

Do they show in Disk Utility, or not?

No they are not - just the HD and DVD drives

So they show up in System Profiler, but not in Disk Utility.

Post the info on one of them from System Profiler. For instance, if I attach a SanDisk Cruzer through a hub, I get something like this

USB2.0 Hub:

  Product ID:          0x0608

  Vendor ID:          0x05e3  (Genesys Logic, Inc.)

  Version:          77.64

  Speed:          Up to 480 Mb/sec

  Location ID:          0xfd120000 / 4

  Current Available (mA):          500

  Current Required (mA):          100

Cruzer Edge:

  Product ID:          0x556b

  Vendor ID:          0x0781  (SanDisk Corporation)

  Version:           1.03

  Speed:          Up to 480 Mb/sec

  Manufacturer:          SanDisk

  Location ID:          0xfd121000 / 8

  Current Available (mA):          500

  Current Required (mA):          200

(But delete the serial number, if any, or anything else of that kind.)

Yes, that is correct - showing in profiler but not in disk utility

This is a lexar jumpdrive 70s

JumpDrive:

  Product ID:          0xa201

  Vendor ID:          0x05dc  (Lexar Media, Inc.)

  Version:          11.00

  Serial Number:          AAOVD4E9LKLC1RV0

  Speed:          Up to 480 Mb/sec

  Manufacturer:          Lexar

  Location ID:          0xfa130000 / 6

  Current Available (mA):          500

  Current Required (mA):          200

That's a tough one, because everything seems normal (btw, did you install any Lexar software?).

I'd've said, try a different brand, but you've already tried that.

Let's try to isolate the problem. In Terminal, issue the command

$ diskutil list

(where $ is your prompt). Does the listing contain anything that could be the USB drive? If yes, please post it.

Yes I have tried HP100v, Sandisk Cruiser & today's purchase the lexar s70.

here is the screen grab from the Terminal.  I ran it twice with the s70 in each port. 

Last login: Thu Jan 12 15:48:29 on console

Joanne:~ embroidery$ diskutil list

/dev/disk0

   #:                       TYPE NAME                    SIZE       IDENTIFIER

   0:      GUID_partition_scheme                        *500.1 GB   disk0

   1:                        EFI                         209.7 MB   disk0s1

   2:                  Apple_HFS Macintosh HD            499.8 GB   disk0s2

Joanne:~ embroidery$ diskutil list

/dev/disk0

   #:                       TYPE NAME                    SIZE       IDENTIFIER

   0:      GUID_partition_scheme                        *500.1 GB   disk0

   1:                        EFI                         209.7 MB   disk0s1

   2:                  Apple_HFS Macintosh HD            499.8 GB   disk0s2

Joanne:~ embroidery$

Unfortunately, I don't know what the problem is, so the following is a bit of a scatter-gun approach.

Self-powered hub.

It is possible (not likely, perhaps a tad more likely if your MBP is a 13″ one) that there's an issue with USB power. If you have one, try connecting a thumb drive through a self-powered hub, ie, one with a separate power supply (not a bus-powered hub).

New user.

Create a new admin user account. Restart and log in as the new user.

Try a thumb drive. If it shows up in Disk Utility, no need to perform the other steps.

Safe Mode.

Shut down, then start in Safe Mode, as described here

<https://support.apple.com/kb/HT1455>

Try a thumb drive again. Then restart as usual (the first start after Safe Mode takes longer; that is normal). Try the thumb drive once more.

Reset NVRAM.

It is possible (not likely) that a setting in NVRAM is causing an error. Follow the instructions here

<https://support.apple.com/kb/HT1379>

to reset NVRAM.

Reset the SMC.

Follow the instructions below

<https://support.apple.com/kb/HT3964>

最後更新：2017-09-03 23:30:24

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