Software :: Filesystem For Flash Memories?
Jan 31, 2011
I've been looking on the internet on what filesystem is best suited for flash memories like USB keys, mmc, SD cards and the likes, but I'm not feeling quite satisfied with the answers I got.There are two use cases I'm dealing with:1) I have an SD card that I want to use for storing some data I'm working on. I need to preserve file permissions, and I need to maximize seek and read speed, but the filesystem is accessed for writes quite often too.2) I want to install a linux distribution on a USB keyNow, I've been reading around that said memories are block devices, and that I should stick to regular filesystems. I went for ext2 for the first case, but I experienced data loss on a brand new PNY SD card, which is unacceptable.
Also, I suspect ext2 is striving for writing files consecutively or in some other harddisk-optimized way, which looks like a complete waste to me.In addition, other filesystems would flood the memory with journal crap.I looked into JFFS2, UBIFS, LogFS and here's what I came up with (some statements are contraddictory):- journaling might shorten the memory's life, and it will definitely slow things down- wear leveling is always hardware-implemented, and a software wear leveling could cancel out with the hardware's effort- hardware wear leveling has often a cheap implementation, and a better software wear leveling is desirable- JFFS2 doesn't store any index on the device; this comes at the cost of a slow mount but the flash memory is accessed less often- LogFS should work well on memories up to 64mb- MTD-oriented filesystems can be used on block devices- ext3 = ext2 + journaling- ext3 is not just ext2 with journalingSo, is there anyone who can add someclarification to all this? Should I go ext2 everywhere, or ext4, or should I try one of those MTD filesystems? If so which one? What's the risk/drawback of each solution?
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May 21, 2011
I was looking for a method of allocating memories on Linux which similar VirtualAlloc on Windows.Requirements are:
1. Size of memories block to allocate is 2^16.
2. Address of memories block is larger than 0x0000ffff
3. Address of memories block must have last 16 bits are zero.
On Windows because lower limit of application address (lpMinimumApplicationAddress) we have (2) obvious right. From (1), (2) and system rules we also achieved (3).
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Jun 7, 2011
I boot up a Linux appliance entirely in RAM, ie. the image has a Linux kernel and an attached ext2 root filesystem.
Now that it's working, I would like to copy the root filesystem from RAM to a NAND flash memory.
Can I just mount the NAND, run "cp -a /* /mnt/nand", reboot with the kernel command line "root=/dev/mtdblock2 rw", and expect Linux to be happy... or is it more involved than this?
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Jun 10, 2011
Sometimes when I plug in a USB flash drive, it is mounted to /dev/usb0 instead of /dev/drivename. This poses a problem for me because I have applications that depend on files I keep on flash drives, and having to frequently change the file paths is difficult. I haven't been able to find anything on this topic with a cursory search on Google or through the Debian reference. Heck, I don't even know what /dev/usb0 is (though I would like to learn, in the interest of being less of a noob). This is happening on a Squeeze system running Gnome, so I believe nautilus is what's responsible for auto-mounting my flash drives.
Beyond that, I don't know what other information I should provide; if you need to know something else, ask me (and perhaps tell me how to access that information). Someone on IRC suggested that I didn't have my drives set to mount in /dev/, but I have no idea how I would go about fixing that. If there's a configuration file that deals with this sort of thing, chances are I haven't touched it since installing this system. Debian installer sees usb drive as cd drive, so it adds it in fstab, but with wrong file system options (udf,iso9660) which is not the one your flash drive uses.
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Feb 2, 2011
I would like to install linux (ubuntu) on a Flash disk with NTFS partition and boot from flash disk, is it possible? Yf yes how could i install ?
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Aug 5, 2010
Some moments ago, I plugged my drive into a computer with some strange data protection software. It turned my drive's filesystem into read only and now it can neither be formatted nor mounted with write option. I've tried
Code:
$ sudo dd if=/dev/zero of=/dev/sdb
but it doesn't work.
The problem is, the computer and the software that have caused this problem has lost forever.
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Nov 11, 2010
I thought this might interest someone out there:[URL].. I used SD cards with MBR formatted as ext2 for backup. After I read these articles, I reformatted my cards with GUID Partition Table and ext4 format. Now I make my backup in half the time!
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May 18, 2011
I am very new to linux, and I have a question regarding the filesystem check (fsck). The power recently went out and when I tried to restart linux the following error appears:
*/dev/sda1 contains file system w/errors, check forced it then goes on to say..
*An error occured during the file system check. Dropping you to a shell; the system will reboot when you leave the shell. Give root password for maintenance (or type Control-D to continue) I wasn't sure what to do, but checked some other online forums and they suggested running fsck manually - so I typed in the root password - and used the command, "fsck -A -V ; echo == $? ==" it then gave the following message
*WARNING!!! Running e2fsck on a mounted filesystem may cause SEVERE filesystem damage
*Would you like to continue (y/n)
Again, I wasn't sure what to do so i just checked no. I then manually turned off the computer and was prompted at the beginning to press Alt-3. I was brought to another screen and it informed me one of the drives was degraded and suggested rebuilding the array. I tried doing this, but it still brings me back to the original error of, "/dev/sda1 contains file system w/errors, check forced," and the process continues.
Also, when I tried to rebuild the array, I didn't backup any of the data on our home directory before doing this (which was probably a big mistake). After being prompted to type the root password, I was able to give the ls command and look at all the directories...the home directory where our data was stored was empty and I am afraid I may have lost some information. Is there a possibility that data was lost when I was trying to rebuild using the old drives?
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Mar 27, 2010
When I try to boot to OpenSUSE I get the following error during boot-up: unknown filesystem type 'reiserfs' could not mount root filesystem - exiting to /bin/sh$
This only started happening quite recently - before this I could boot to Linux quite happily.
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Mar 11, 2011
I am trying to mount a file image, like this
mount -o loop /tmp/apps.img /media/apps
But I get the following:
mount: you must specify the filesystem type
I try ext3:
mount -o loop /tmp/apps.img /media/apps -t ext3
dmesg says:
error: can't find ext3 filesystem on dev loop6.
I've also tried ext2, vfat etc. How can I detect the filesystem type of apps.img?
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Jul 9, 2010
I have a following problem: Recently my drive with Ubuntu 9.4 has mysteriously stopped working, i.e. when I switch the computer on it informs me that GRUB didn't find the filesystem. Well, I suppose it happens.
First, I though it was due to the drive dying, but I popped it in an external enclosure and HDTune told me the drive was fine. Wanting to recover the files on the drive before reinstalling I first tried to mount it in said external enclosure under Windows (I have Win Ext2 driver installed which used to work just fine). This time, however, drive gets assigned a letter but upon opening it Windows popped up an error saying that the drive was not formatted and whether I would like to format it then.
Unfazed by this streak of failures I tried to mount it under Linux but, alas, to no avail. I might have tried every single -t operator under mount command but it still won't budge and let me mount.
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Mar 24, 2010
I've had a look at some similar threads but as I'm very new to linux they're already a bit technical for me. Sorry, this calls for someone with patience. I gather from other threads that disconnecting an external drive without unmounting is a no-no, and this seems to be the likely cause. Now the disk is read only and I'm unable to change any settings through the usual control panel on ubuntu. I'm just not familiar with the terminal instructions. I tried to cut and past a few command lines from other threads but I got some warnings that proceding could damage data. Like this one: WARNING! Running e2fsck on a mounted filesystem may cause SEVERE filesystem damage.
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Oct 23, 2010
i'm in 64 bit kubuntu, with the the nswrapper in 10.10http://www.metacafe.comin firefox i get the sound but not the video in metacafe, when the video is unblocked by flash block. Others have the same problem?
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Oct 2, 2010
I get this link [url] for change my version of flash, because I can't playing flash when I have turned on effects. So I downloaded file for my Ubuntu 10.04 64-bit and I extracted it. But there is problem, because I don't know on which location I need to copy .so file?
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Dec 13, 2008
I'm trying to load the flash stuff in webpages, but it says i need the flash plugin.
I download the YUM rpm installer, and use yum localinstall to do it.
Terminal say: /home/wade/Download/adobe-release-i386-1.0-1.noarch.rpm: does not update installed package.
I have already tried installing it, and it says it worked fine, but I'm still unable to view flash.
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Sep 23, 2010
Did anybody tried installing the latest adobe flash named Square for amd64 systems? I was interested in knowing whether there is any improvement in the performance. I also want to know how to replace my existing 32 bit wrapper based flash on 64 bit browser and install this 64 bit flash.
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Sep 26, 2010
I recently installed Ubuntu 10.10 AMD64 beta. After installing the flash player, everything worked fine. I installed a few updates, as well as Ubuntu Stuido from the synaptic package manager, and when I rebooted, I can't hear any sound from flash content displayed in Fire Fox. All other sounds work fine, and I made another user account as a test, and that account has full audio functionality, including flash...
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May 19, 2011
Flash is no longer working in Mozilla Firefox after the most recent flash plugin update. I couldn't find any information on it.
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Dec 20, 2010
i downloaded adobe flash player multiple times but flash movies still not working what do
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Sep 18, 2010
You may know that there was a security release for Adobe Flash Plugin for Linux x86 but not for x86_64. There has been a development:
See : http://labs.adobe.com/downloads/flashplayer10.html
It works fine here. I have a Multilib Slack 13.1 stable.
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Oct 1, 2010
I am using F13, and I successfully installed Adobe Flash Player.
So, here comes the problem - I installed Google Chrome browser after that, and whenever I try to view flash content it says "missing plugin".
get.adobe.com/flashplayer/ says:
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Jun 26, 2010
Flash was updated two days ago on my system:
Since then, I have been unable to get any sound out of flash. All other sound sources work fine.
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Oct 3, 2010
I installed Boxee on my 64bit install. I had to edit the DEB so it did not install Flash, because Ubuntu still insists on installing the 32bit version which always borks Firefox.
But now I cant run synaptic without getting complaints of broken packages. I just want to blacklist boxee from from annoying the hell out of me, but keep it installed. How do I go about doing that?
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Sep 3, 2010
i've suddenly got problems with flash - it was working fine until a cuple of days ago.i have flash 10.1.82. 76 ubuntu0.10.04.2 on ubuntu 10.04, but videos and other flash sites tell me i need to upgrade to the latest flash version 10.i've tried flash-aid, which seems to run ok but i still have the problem.at the same time, i can suddenly only run firefox tools > add-ons in safe mode - if i choose tools > addons in normal mode, fx locks up completely, and finally gives me the option to force quit. i've tried re-enabling add-ons one at a time, but no problem until i come out of safe mode.i'm wondering if this is a firefox problem rather than ubuntu or flash. my firefox is 3.6.8
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Sep 3, 2010
I have a USB flash drive, which is bootable and I would like to copy the whole drive to a different drive.Can I just do a low level dd copy between both USB memory drives, or do I need to make an ISO of the source, and then put that ISO on the destination? I figured I could ask in less time than trying, and exhaustively testing to make sure I had it right...
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Jun 1, 2009
I just installed Adobe Flash Player 10 and it says it's installed, when I go to firefox and Epiphany it still has flash player 9, Ive quited the browsers and everything Ive uninstalled/reinstalled still no luck.
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Aug 15, 2010
In my frustration to get adobe flash working in firefox I deleted the /usr/lib/flash-plugin folder. Now when I try to uninstall "Flash-Plugin" from YAST it fails as it can't find the sub-folder. I also cannot install the latest version of flash player as it says that it is already installed - So I am stuck in a loop.
I am running SUSE 11.2.
Is there a config file of installed programs that I can modify to remove the "Flash-Plugin" entry, or is there another way to get over this problem.
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May 19, 2009
I just installed firefox and flash-plugin.The version of firefox is 3.0.10, package is firefox-3.0.10-1.el5.centos.The version of flash-plugin is 10.0.22.87, package is flash-plugin-10.0.22.87-1.el5.rf.But firefox crashes when there is flash in web page, unless disable flash plugin in firefox.
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Mar 29, 2010
I made a persistent install of Ubuntu on a flash drive. I made changes to that installation. The software (Unetboontin) sets this all up. I think it partitions it for you. How do I image that flash drive to another flash drive?
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Oct 1, 2010
I would like to build a SAN with like 4 TB of space on it. What is the best way to accomplish this task?
- What exact hardware would I need.
- What exact software do I need.
- How to bond two Ethernet cards together to get better network performance out of the box
I am looking to find a cheap rack-mount server cabinet. What is the best file system for a SAN? Is there a particular distro that works well with this? I prefer CentOS as that's what I have been learning on.
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