Archive for November, 2008

[NPTEL]High-Quality Free Video Tutorials by Profs of IITs

November 29, 2008

NPTEL is an acronym for National Programme on Technology Enhanced Learning which is an initiative by all seven Indian Institutes of Technology (IITs) and Indian Institute of Science (IISc) for creating course contents in engineering and science.

Basically, Senior Profs of Indian Institutes of Technology (IITs) and Indian Institute of Science (IISc) have recorded video of their lectures and they have been hosted at Youtube.these are high quality lectures by experienced & well trained. The course contents focus mainly on engineering and science.

The various Courses there are(Click on them to view complete list):

You can find more information on its Website and don’t forget to read F.A.Qs. Dowloading videos from youtube is easy, search on google with “download youtube videos” in search box.

These Courses are very useful for Student who have a habbiat of bunking classes,working professionals who don’t have time to do a regular course and people who are curious by nature and want to know everything. Its a +1 from my side

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[Linux] Ext3 partition detected wrongfully as ext4

November 14, 2008
Oh No!

Recently, A partition on my backup harddrive was corrupted. It was i was clueless how it had happened. further, now the partition was refusing to mount and it was being detected as ext4.
I tried mounting is manually:

gaurish  ~  $   sudo mount /dev/sdb6 /media/fl/
mount: unknown filesystem type 'ext4'

Dmesg said

EXT3-fs: sdb6: couldn’t mount because of unsupported optional features (ca9bc1e0).”

I was not sure what to do next
So i cried for help on various online Forums[1][2][3] but all in waste.
After that i got pissed off and decided to take matter into my own hands and starting reading on how Partitions in linux are made etc. Then i came to know about superblock.
Bingo!, i had a bad superblock.
Here is a Quick Procedure to recover from a bad super block(read nightmare)
Open Terminal and type the following commands:
1) see backup superblock location

~ $ dumpe2fs /dev/sdb6 | grep -i superblock

Output:
dumpe2fs 1.41.3 (12-Oct-2008)
Primary superblock at 0, Group descriptors at 1-2
Backup superblock at 32768, Group descriptors at 32769-32770
Backup superblock at 98304, Group descriptors at 98305-98306
Backup superblock at 163840, Group descriptors at 163841-163842
Backup superblock at 229376, Group descriptors at 229377-229378
Backup superblock at 294912, Group descriptors at 294913-294914
Backup superblock at 819200, Group descriptors at 819201-819202
Backup superblock at 884736, Group descriptors at 884737-884738
Backup superblock at 1605632, Group descriptors at 1605633-1605634
Backup superblock at 2654208, Group descriptors at 2654209-2654210
Backup superblock at 4096000, Group descriptors at 4096001-4096002

2) Run Fsck with Alternative Superblock

$ sudo fsck -b 32768 /dev/sdb6
fsck 1.41.3 (12-Oct-2008)
e2fsck 1.41.3 (12-Oct-2008)
/dev/sdb6 was not cleanly unmounted, check forced.
Pass 1: Checking inodes, blocks, and sizes
Pass 2: Checking directory structure
Pass 3: Checking directory connectivity
Pass 4: Checking reference counts
Pass 5: Checking group summary information
Free blocks count wrong for group #12 (30380, counted=30381).
Fix? yes

Free blocks count wrong for group #127 (15027, counted=5927).
Fix? yes

Free blocks count wrong (10539272, counted=10530173).
Fix? yes

Free inodes count wrong for group #116 (32732, counted=32729).
Fix? yes

Free inodes count wrong (24812957, counted=24812954).
Fix? yes

/dev/sdb6: ***** FILE SYSTEM WAS MODIFIED *****
/dev/sdb6: 934/24813888 files (6.2% non-contiguous), 14282211/24812384 blocks

3) Done! Partition is successfully recovered and data is safe. now we can mount it normally.

$ sudo mount /dev/sdb6 /media/test

Now, After this incident i have to rethink my backup strategy, which till now have been reply solely on HDDs as backup medium.
Comment & Suggestions are welcome 🙂

[Orkut] Get Latest Updates By SMS for Free

November 6, 2008


Orkut has started a new service called “Orkut SMS” by which you can receive latest scraps from your scrapbook as text sms on your Mobile. It means, now you would be able to get scraps from your orkut profile right onto your mobile phone. so it would work on crappiest mobile phones which don’t have fancy features like GPRS or EDGE. Further you can also reply to scraps from your mobile itself.

Its Advantage is that this service does not require GPRS connection on mobile. It is entirely SMS based.if you are looking for GPRS based service try http://m.orkut.com.

It is to be noted that Receive SMS is entirely free but you would be Charged Rs.2/- per SMS(1/- for MTNL) for sending a SMS. In my opnion the best utilization of service is to Receive scraps, sending scraps from mobile should be generally avoided unless urgent as its charged.

What is orkut SMS?
orkut SMS allows you to stay in touch with your orkut friends using text messages from your mobile phone.
How does orkut SMS work?

1. Register your phone on the orkut website.
2. Send SMS commands from your phone to the appropriate orkut SMS number. Number for India:- 56555

SMS Commands

I am Using this on my Vodafone Mobile number from past week. I must say its very fast, i am getting scraps on SMS even before e-mail notifications.

If you are a Orkut user, you should try it at-least for receiving scrap which is free.
Currently Supported Operators:

  • TATA
  • BPL
  • Aircel
  • Reliance
  • Spice
  • MTNL
  • Vodafone

More Details

[BSNL Broadband] Double Broadband usage offer for November,2008

November 1, 2008

All Bsnl Broadband users Rejoice!, Bsnl has come up with a nice way to say Happy Diwali to its subscribers with special scheme under which All broadband users would be double of their monthly free download limit during month of November 2008 without any extra charge.

This offer is applicable to subscribers who have have BSNL Broadband subscription
continuously for past six months as on 01.11.2008. The scheme shall be available for all
Broadband plans.However after November08, all customers would get back to their usual free download limit.

Overview of Download/Upload Limit

Name of Plan

Normal Usage limit

Usage limit during November
Home 125 150 MB 300 MB
Home 250 1.0 GB 2.0 GB
Home 500 2.5 GB 5.0 GB
Home 500 C 1.5GB 3.0 GB
Home 500 C+ 2.5GB 5.0GB
Home 1000 5.0GB 10.0GB

Subscribers of Unlimited plan would be disappointed, as there no double bandwidth offer for them. This offer is is applicable all over india, however your local exchange might deny this as they must not received “official communication” regarding this. For the record, here is the official Letter that BSNL Head office, Delhi is sending to all its circle offices. This letter is signed by P.K.Shah,DGM (Broadband Service,BSNL.Corporate Office. so this is should be enough proof.

If Bsnl still denies your free usage, take Print-out of below letter and show it to concerned officials. Surely, they can’t deny a official Letter 😀

Broadband Cell Second Floor
Bharat Sanchar Bhawan
Janpath New Delhi ? 110001
Tel: 91-11-23710183
Fax: 91-11-23734052
__________________________________________________ ___________________
No: 64-03/08 Broadband Dated: 22.10.2008
To.
1.All Head of Circles/Metro District
2.GM (CMTS/Mktg) BSNL.CO.
Sub: Promotional Scheme for Broadband Customers as Dipawali Bonus.

Approval of competent authority is here by conveyed for extending Dipawali
scheme for BSNL Broadband customers who have BSNL Broadband subscription
continuously for past six months as on 01.11.2008. The scheme shall be available for all
Broadband plans.

1)In the month of November, the subscribers shall be permitted to avail double usage
of free download i.e. twice of what is available in the plan normally. The scheme shall
be applicable for all Broadband Plans?.

2)All plan change requests received in the month of November shall be made effective
from 1 st of December?.

3) The scheme benefits shall be available only for customers who remain active
throughout November 2008.

You are requested to kindly give wide spread publicity to this scheme through
messages in SMS, IVRS etc, in addition to other print and electronic media.

The message for mobile customers is furnished below.

* Dear customers, Avail double usage of free download for all BSNL Broadband
plans in the month of November 2008 as one time Dipawali Bonus.

(P.K.Shah)
DGM (Broadband Service)
BSNL.Corporate Office.

Happy Diwali & Enjoy Downloading……

[Update] The Offer is now over as it was valid only during november month, hope you enjoyed doubled Usage.

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