Rescan USB drives or SD cards

Hi, this is my first time posting on a forum and i'm having the following question,
I often eject my USB device or SD card and after want to reuse it, the way my mac is placed it is annoying to always have to remove my drive and put put it back to reuse it, so I wondered if there was a way to rescan ejected available devices without removing it and putting it back every time ?
Thanks in advance

Edited:
Actually, I'm still wrong. That's what I get for trying it with a hard drive instead of a flash drive. Apparently when you eject a flash drive it powers off and diskutil won't list it until it's been plugged in again. I'll see if I can come up with a solution, but nothing comes to me right now. It sounds like your best bet is to unmount the device instead of ejecting it. If you don't want to use the disk utility to unmount the device, you can use the terminal or you can use automator to create a macro to do it for you. If you use automator, you can bind it to a function key or menu option so you don't have to manually open the automator workflow each time.
The terminal command to unmount a volume is:
diskutil unmount /Volumes/[volume_name]
where [volume_name] is the name of your USB device as it appears in the finder. You can also use the disk identifier instead of /Volume/whatever
Ah, you're right. I rarely use the disk utility GUI so I didn't realize it doesn't list the disk if you've ejected it.
It still works from the terminal, but with one modification. You may need to use mountDisk instead of mount in the second command:
diskutil mountDisk [disk_identifier]

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Hi,
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udisks --mount /dev/sdb2
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"groups user" outputs :
lp wheel games network video audio optical storage power users
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realname = ''
seat = 'Seat1'
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active = TRUE
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x11-display-device = '/dev/tty7'
display-device = ''
remote-host-name = ''
is-local = TRUE
on-since = '2011-08-15T08:56:03.716103Z'
login-session-id = '1'
Session1:
unix-user = '1000'
realname = ''
seat = 'Seat2'
session-type = ''
active = FALSE
x11-display = ':0.0'
x11-display-device = ''
display-device = ''
remote-host-name = ''
is-local = TRUE
on-since = '2011-08-15T08:56:03.573029Z'
login-session-id = '1'
For those who don't have time to read the installation script, DBUS is in the DAEMONS list of rc.conf, and .xinitrc launches : exec ck-launch-session startxfce4
Any idea ?
Last edited by choubbi (2011-08-15 15:05:04)

Thanks a lot !
That worked !
I stumbled across this part of the wiki several times before, but didn't really understand so I had not tried.
If anyone's interested in the script, here's the corrected version :
#!/bin/bash
# expected environment : freshly installed archlinux, login : root.
echo "Are you connected to internet ? If not, please Ctrl+C and reload this script when connected"
echo "Otherwise, press ENTER to continue installation"
read var_dummy
echo "Creation of the user : please type in your user name :"
read var_username
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EOF
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EndSection
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Driver "fglrx"
EndSection
EOF
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EOF
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sed '/^PS1/c\' </etc/skel/.bashrc >/root/.bashrc
cat >> /root/.bashrc << EOF
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EOF
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chown $var_username:users /home/$var_username/.bashrc
# How does one do that automatically ?
# Manually add user to sudoers
EDITOR="vim" visudo
# Reboot, because it's quick and I'm too lazy to learn how to start all the daemons and others.
reboot
The important part of the script to solve the problem is :
cat > /home/$var_username/.xinitrc << EOF
#!/bin/sh
# ~/.xinitrc
# Executed by startx (run your window manager from here)
exec ck-launch-session startxfce4
thunar --daemon &
EOF
chown $var_username:users /home/$var_username/.xinitrc

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...Ohmmm madhi padhi ohmmm....

Pb with X200, NEC based USB 3.0 PCI card and external USB 3.0 HD

Hello, I ordered a USB 3.0 Express Card based on the NEC chipset. I am using a Lenovo X200 under XP SP3 and I have an external Buffalo Ministation USB3.0 HD. No problem to install the Express Card driver, the card is recognized but the HD won't mount. I have the USB connection beep and in the next 10 sec the USD disconnection beep. This is not a low power issue, I connected to the Express Card a power supply and have the same issue. In addition, this config, Express Card and Ministation Buffalo just work fine on a T60 under Windows 7. Any idea? Many thanks ! Tom

craig stewart wrote:
I would like to add IO to my Mac Pro Details of it are below
I have looked at several options and would be happy to go with either eSata or USB 3.0. I have heard some bad reviews about the USB 3.0 PCI offerings out there though.
On the one hand, I have an unused eSata enclosure so I would not have to buy one, on the other hand a few USB 3.0 ports on the machine would allow grerater expandability with a USB 3.0 hub hung off the back. ( can you get eSata hubs? never thought of that until just now)
The nearest thing to an eSATA hub is a 'SATA port-multiplier'. This allows connecting up to 4 SATA drives to a single SATA port.
Note: Not all SATA or eSATA cards support 'port-multiplier' functionality. The CalDigit card says it does support port-multiplier enclosures, what this means is that a single eSATA cable can be connected to an external box containing multiple SATA drives and see and use them all.

Blue screen when booting from USB drive in UEFI mode (2013.07)

SOLUTION for me was to update the firmware on my ASRock mb as thatu pdate changed the EFI software (by American Megatrends) version from 2.00 to 2.31. However, other users are still experiencing the blue screen.
SHORT VERSION
When I try to boot Arch Linux 2013.07 with an USB drive in UEFI mode (for installation), I get a blue screen (which is rather a literal description and not a hint towards the old Windows' one) with the message
Failed to install override security policy (14): Not found
LONG VERSION
I made an USB installation media (product: Intenso Rainbow) by following this advice on the wiki.
I used the july release of Arch for that. First of, after installing the image to the USB stick I found that I needed to correct the label in the archiso-x86_64.conf file to ARCH_201307 (or was it the label of the usb stick, can't remember right now). (Pretty sure it was the same problem with "Linux Live USB Creator" which I used 3-4 months ago...)
After doing that, I rebooted and selected the entry
UEFI Intenso Rainbow
from this list of entries:
SATA HDJ ... something (the hard drive where Win 7 64 bit is installed with all programs)
SATA something (hard drive which only contains data)
Windows Boot Manager
USB: Intenso Rainbow
UEFI: Intenso Rainbow
It went to a blue screen with a message in white text saying
Failed to install override security policy (14): Not found
Below that was an OK button which had a black rectangle over it.
After I experienced the bluescreen, I tried booting the
USB Intenso Rainbow
entry and the boot process then worked fine, I got to that Arch menu where I could choose
Boot Arch Linux (x86_64)
Boot Arch Linux (i686)
Boot existing OS
Run Memtest...
and so on...
But just to make sure, I then did the check for UEFI mode according to this and only saw a folder acpi and ... something else I can't really remember, but it definitely was not efi. Thing is, I needwant to boot into UEFI mode as I have Win 7 already installed in UEFI mode.
Some info about my motherboard: it's from ASRock and is called H67M. The BIOS is dated to 2011-10-26 and is version 1.7.
So far, I only found a mention of the problem here at superuser.com.
Last edited by jones (2013-07-15 07:15:18)

Ok then, so this thread has also become about the blank screen problem when booting (in this particular case, Arch 2013.06 since 2013.07 seems to be worse).
srs5694 wrote:Typically, you adjust kernel boot options using your boot manager or boot loader. In GRUB, you hit the "e" key to open an editor. In rEFInd, you hit F2 or Insert twice. I don't recall offhand what key does the job for gummiboot (which I'm pretty sure the Arch installer uses), but I'm certain it's got the feature.
You are right. Thanks. I realized I had the gummiboot config right in front of me all the time. It's the file 'archiso-x86_64.conf' in \loader\entries (on Windows).
An addendum: I think the USB: Intenso Rainbow boot option takes me into a GRUB menu. Hitting 'e' in this "big" and fully designed menu didn't do anything IIRC. Hitting 'Tab' did the trick to get into editing the boot command line.
Hitting 'e' worked in the gummiboot menu though.
So I tried booting with the following options (also by combining some of them)
nomodeset
acpi_backlight=vendor
radeon.modeset=0 (I have a Gigabyte 7870 card in this desktop machien)
i915.modeset=0
but it did not help.
To be rather safe than sorry: I should mention that there are two grey-ish bars visible on the top and bottom of the screen after I try to boot the first entry, Arch Linux archiso x86_64 UEFI USB. Always has been with those two older Arch version (2013.05+2013.06). I also found another thread where one user talks about using the VGA port of the monitor, which I am currently not, I am using the DVI one, so that's worth a try too. EDIT It did not help either. What I did was setting the primary graphics adapter in the UEFI north bridge configuration menu to 'onboard' which worked immediately when rebooting (I hit the button labeled "Source" on my monitor and it showed it is using the "Analog" mode), but the problem just stayed the same. Adding aforementioned boot options or a combination thereof did not change anything.
Thanks for the e-mail addresses, I sent one to James Bottomley.
Last edited by jones (2013-07-07 11:12:05)

Disk Utility 13 problem with USB drives

There appears to be a problem with Disk Utility 13 (part of OS X 10.9). At least, so far as I can tell, everything traces back to this app, or possibly OS X 10.9 itself.
I recently upgraded my MacBook Air to OS X 10.9 (reformatted hard drive, installed system from scratch, updated with all the latest Apple updates). I pre-checked all my third party software to make sure it was 10.9 compatible before installing it after the system cleanup, so everything I’m running supposedly has been approved as safe for 10.9. But I’m seeing a problem formatting USB drives that I do not encounter when running under 10.8.
I have a Seagate STAA500101 (“FreeAgent GoFlex”) drive connected via Seagate’s USB3 adapter that I’ve used for some time as a Time Machine backup. Post-overhaul, I decided to erase the backup and start fresh. When I attempt to format it (single GUID partition) with Disk Utility, I see the following messages go by:
Formatting disk1s2 as Mac OS Extended (Journaled) with name Untitled 1
Could not mount disk1s2 with name (null) after erase
Then there’s a pause, and the format appears to conclude fine. But if I run a “Verify Disk” immediately, I get this:
Verifying partition map for “Seagate FreeAgent GoFlex Media”
Checking prerequisites
Checking the partition list
Checking for an EFI system partition
Checking the EFI system partition’s size
Checking the EFI system partition’s file system
Checking all HFS data partition loader spaces
Volume on disk1s2 has 0 bytes of trailing loader space and it needs 134217728 bytes
Problems were found with the partition map which might prevent booting
Error: Partition map needs repair because a data partition needs loader space.
As the drive has just been formatted, that seemed odd. I took it over to another Mac still running 10.8.5 and formatted it there — it worked just fine. Verified just fine. Took the drive back to my MacBook Air and tried to verify the disk — same failure.
I wanted to rule out bad media, so I took a Lexar 16GB USB flash drive and tried to format it with Disk Utility 13 — got the same problem.
The only success I’ve had formatting USB drives under 10.9 is to boot up into OS X Recovery. Disk Utility there formatted my Seagate drive without an error. But once I booted back into normal 10.9 operating mode, the drive once again fails to verify; it makes me leery about using it as a Time Machine backup.
I suppose it’s possible there could be some background component like Sophos causing problems when formatting drives, but if I format a drive via OS X Recovery or another Mac under 10.8, that wouldn’t explain why the drives fail to verify.
Anyone got any other observations on this issue?

Problem resolved. I'm posting this note for anyone else who might run into this situation and come across this discussion.
It actually did turn out to be Sophos -- Cloud, that is. I'd been using Sophos' free Mac antivirus software on a variety of systems but forgot that I was now testing out Sophos Cloud on my own MacBook, which is their new endpoint solution, and supposed to be compatible with OS X 10.9 (although the Mac version is listed as "beta") Sophos Cloud includes a new feature called Device Control which allows you to create a company-wide policy to control access to hardware such as USB drives, optical drives, etc. But apparently it's still pretty buggy. I had my Device Control configured with the default setting of "monitor but do not block" but it was most definitely gumming up the system. With Sophos Cloud installed, here's what happens if I try to run "Verify Disk" on any attached drive. Note on the left side how "disk2s2" shows as a sub-volume for each hard drive.
So if I uninstall Sophos Cloud, reboot and rescan, here's what I get:
Works fine. Note that the "disk2s2" subvolumes are also gone. This is the way Disk Utility also appears on a 10.8 or 10.9 system, even if you have the standard free Sophos for Mac software installed. It's only Sophos Cloud that's not playing nice. It also appears to have stopped me from being able to play DVDs from an attached Apple USB SuperDrive -- that problem was likewise solved by removing Sophos Cloud.

Rescan USB drives or SD cards

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