ID #1181

Why do I find the disk is suddenly read-only or get the message "mounting root filesystem as read-only" or similar?

First off, check the disk isn't read-only. If it's a floppy, make sure that one of the holes in the disk should be closed by the little black tab. Otherwise, this usually indicates a (possibly minor) problem with the underlying filesystem.

Freesco uses a filesystem called UMSDOS to let itself be used on DOS FAT-formatted disks. This allows you to use the complex and powerful Linux filing system (e.g. symbolic and hard links, long, case-sensitive filenames, many different permissions, and the file owners / groups concept) without having to reformat your hard drive. It works by letting UMSDOS "pretend" to be a Linux filesystem, and then instead of writing directly to the disk, UMSDOS writes everything down in "normal" files on a FAT disk (which is why, when you look at the Freesco directory in DOS, you see strange filenames and ---LINUX--.--- files everywhere).

If, when Freesco boots, it detects any problems with the underlying FAT filesystem or these files, it will automatically revert to read-only mode. This is a very sensible safety precaution. You can still retrieve all your important data but can do no further damage to the system.

In Freesco, where critical data shouldn't really be stored on the same disk, you can just boot into DOS or Windows and run SCANDISK to fix the FAT filesystem as you would normally. On the next boot into Freesco, the UMSDOS system will try it's best to repair itself and continue. Ninety-nine percent of the time, a SCANDISK will report only lost clusters and, once fixed, Freesco will continue without losing any data. There might also be a more serious problem with the disk, though.

This problem has been frequently reported by people who use packages on Freesco which are in danger of being in the middle of writing to the disk at the time the power is turned off, e.g. FTPD, Samba, Squid etc.

Prevention is almost certainly better than the cure, here. To stop these sorts of disk errors occurring, it is always advisable to properly shutdown the router before you switch off the power. Typing halt on a telnet connection or on the Freesco console (after logging in) will properly close all files, leaving it safe to shut off (the Linux equivalent of Windows' shutdown screen).


If you intend on leaving your Freesco router switched on when nobody is present to run SCANDISK in the event of such an occurence, it is often suggested that you add a line to your AUTOEXEC.BAT to run SCANDISK just before you run Freesco:


This would mean that on every reboot, the filesystem will be checked and, if damaged, automatically repaired. From Scratch believe that this is slightly dangerous and could cause you to lose data, as you cannot see precisely what SCANDISK is supposed to be fixing.

The DOS command CHKDSK /F is slightly better as it will only fix certain minor problems on the specific drive you tell it, it is included in older versions of DOS and it can give an ERRORLEVEL depending on whether it had to fix anything . This can be easily used to, for example, copy a fresh version of Freesco to the hard disk or to rewrite the floppy from the disk image and reboot, or to make a "flag file" whose presence can be tested for from a remote location, to see if the check completed successfully. CHKDSK is not as reliable as SCANDISK, however

Last update: 2005-03-26 00:10
Author: Mathieu CATTIN
Revision: 1.0

Print this record Print this record
Send to a friend Send to a friend
Show this as PDF file Show this as PDF file
Export as XML-File Export as XML-File

Please rate this entry:

Average rating: 0 from 5 (0 Votes )

completely useless 1 2 3 4 5 most valuable

You can comment on this entry

Comment of Microsoft Office 2010 (2011-04-28 03:37:25):
ADD Microsoft Office adults' main impairments Microsoft Office 2007 include organization. pay more attention to detail, Office 2010 and the ability to Office 2007 finish tasks. Unluckily, there are a lot of technologies to support these outlook 2010 symptoms. Keep in mind: just ms office 2010 as a diabetic person needs insulin office 2010 home to thrive, be competent with assistive technologies Microsoft Office 2010 free is one of the necessary parts microsoft word of life for people with ADD if you feel afraid by download microsoft office 2010 the demands of learning micro office 2010 a new technology. it is found in the past of Office applications a design scheme. It calls the ribbon ms office 2007. One is called Groove office 2010 professional, a peer-to-peer collaboration tool, it is serviced in the Office 2010 key high-end Ultimate. If you're an adult with ADD, you download office 2010 should know MS office 2010 download the concept of having microsoft office 2007 home your addresses and appointments Microsoft Office 2010 download scattered all office 2007 key over well. You are able to office professional 2010 manage by organizing piles, but that doesn't last. I had some outlook 2010 key Franklin Planners at one time, they are all Office 2010 free in different places, everyone prone to getting lost. I used Microsoft Office 2010 key to use inspirational quotations or beautiful art on the cover to collect address books, everyone with its own separate Office 2010 download, overlapping collection of contact Microsoft outlook 2010 information. However Microsoft Office 2010, note-taking program one note that was just for a standalone product which can MS office 2010 key be found in the office 2010 microsoft Home and now Microsoft outlook, Ultimate, and Enterprise editions.

Comment of dsad (2011-06-13 08:57:55):
As for the petite bride, an A Line Wedding Dresses would be perfect, simply because this kind of dress may well lengthen your body and make you look slim. In this sense, you should refuse sheath-style Wedding Gowns, in that sheaths may possibly shorten the entire body. And full skirts which will cause you to be "bottom heavy" ought to also be rejected.For broader shouldered brides, you can attempt bridal dresses with halter or off-the shoulder neckline, or you'll be able to adopt strapless Wedding Gowns together with fine cute accessories which can go well with your body the Shoulder Wedding Dresses for brides will work nicely with large-busted brides. This dress style may appeal the attention upwards by stressing the shoulders. Bear your mind to steer clear of full skirts which may possibly make your whole body look huge and fat. Narrow skirts are your best choice.

Comment of coach factory outlet (2011-09-26 10:50:39):
coach bags  coach purses  coach outlet  coach factory outlet  coach outlet  coach factory outlet  coach outlet online  coach factory outlet  louis vuitton online  coach boots  louis vuitton bags outlet  louis vuitton bags  louis vuitton sale  louis vuitton outlet  Moncler Outlet  

Comment of louis vuitton outlet (2011-09-26 11:06:12):
Christian Louboutin  Christian Louboutin Soldes  Louis Vuitton  Borse Louis Vuitton Outlet  Burberry Outlet  Louis Vuitton Handbags  Tiffany UK  Tiffany And Co  Burberry Scarf  Moncler  Tiffany Jewelry  Tiffany Outlet  Coach Outlet Store Online  chanel tassen  Burberry Sale  Louis Vuitton Borse  Louis Vuitton Outlet  louis vuitton sale  Louis Vuitton Bags  sito louis vuitton  Sac Louis Vuitton Pas Cher