[HD2 Android NAND Development] mike2nl:
1st please don't take this personal, it is a lot of frustation from around here what i can read from users.

And the other users and OP's or dev's react on this. And this gives more trouble then needed.

normally i would say you are right but:

- search for Ubuntu Karmic and ext4 issues (as Sample)

- search for gentoo and ext4 issues

- search for kernel 2.6.3x.x ext4 issues (and other kernels who support's ext4)

- search for use beta stuff on beta stuff (generic)

- link for backup story

- very intersting story (one of thousand's): There has been a lot of discussion about the ext4 data loss issue

copy of text in the end of that article:

ext2: No robustness guarantees on system crash at all.

ext3: In the default data=ordered mode it is safe, because data is written before metadata. If you crash before the data is written (5 seconds by default) you get the old data. With data=writeback mode it is unsafe.

ext4: Currently unsafe, with a quite long window where you risk data loss. With the patches queued for 2.6.30 it is safe.

btrfs: Currently unsafe, the maintainer claims that patches are queued for 2.6.30 to make it safe

XFS: Currently unsafe (as far as i can tell), however the truncate and overwrite method is safe.

The linux world is full of them. Most users have no issues with that

but it is known that there a lot of users too whith issues around

using, restore and compiling. And no admin will say that he has

issues around that, to hos boss with windows know how, ha, ha.

(boss know how means, he can click on a popup)

Ok the ext4 file system has a lot more features, so as:

- it can handle larger file systems

- is a multiblock allocator

- has improved timestamps

- better journal checksum

- a faster file system checking

But what when a lot of HD2 users have issues? You can read

that in all threads around HD2 NAND and SD. Ok in some cases

the SD card is the issue. I have seen that on my own. But after

around, i must think, around 200 tests with sd cards, i can use

a lot of them ;-), i have seen only 3 or 4 of them with really good

performance. Strange enough the samsung, brrr, sd card was one

of the best cards. But now i know why, the chips that they use.

The price for them is higher then the default.

But self with these very good crads i had issues with different HD2.

Everybody forgets the bad block issue. Why the heel the normal

hard disk reseve room about bad tracks or blocks? NAND can not do

this on his own. It uses the next freee good block. But while using

the phone this can change and after that NAND can not change

this bad block. So you have issue when you will restore things or

1st uses issue with an app.

And there is a lot more. I had made my doc on that know how. Around

memory media and nand technics. WHat i have done in our

labotry was to use ordinary expencife NAND and we have changed

the original one on a different phone, only for tests. You can't

believe the difference.

At 1st we must understanbd the point of Nokia, Samsung and HTC.

Build a phone that nothing costs and sold it very expencife. That the

first order. Then the customer with the wishes, ha, ha.

I think you can imagine what's going on in that world. So at the end

we must be very sure what's working with our ext4 case. And so long

nobody has shown me the test procedure how thinsg are done,

forget it. All things are done by try and then posted as tested.

Sorry, that are NO tests in the way of testing procedures. WE

all have to set up these things, but NOT with the most DEV's here

on XDA. BAdly to say that the most dev's have isssues..........

I have seen this on my own, but nobody will listen.

The only guys was Laurentius26 (winmo), michie (android), overcome

(android), and the cordroid team, so far i know. Because Tigermoto

is our key to them. And he is listen.

I think you can read a lot of frstation in all this, and yes it is.

So i am back to trhe roots here by cordroid, becuase here i am feel

at home and welcome. My intention is to help with real know how,

and not try and yes it is good. I am very busy to make test procedures

for all of us. But the dev;s outside are laughing over that. Please,

but at the end we will see who has to pay *lol.

There are all so very good devs and people with real know how here

on XDA, otherwise XDA will not be great at it is. And that is the point

for me to be here, to talk with guys who has the same issues.

And now it is enough *lol, otherwise my coffee is to cold to drink it.

Last but not least, we need some standards for all this, but who will work on that?

I have asked twice the XDA admins about that, no reaction and that says more then enough.

Because the corrupt download for ext4. I mean the DAF.exe file, and will find it again.

BTW:

- the link for ext3

- the link for ext4 on wiki.

- a genric knowhow article, there are more them this one.

- the 4K file size issue (because some of the devs provide this one (data loss))