usb host for HP pendrive

So you need to look closer at why it is not changing to 1!

Look at your two examples that do work, and compare what's happening with the one that doesn't work.

"What,s the reason behind it"

There is a bug (or bugs) in your software that you just happen to get away with for the KIGNSTON 8 GB, SANDISK 4 GB pendrives, but your luck runs out with the the HP drive.

This is the big difference between just trying something a couple of times and saying, "it works" - and fully testing it to ensure that it complies with all conditions and requirements!

So you need to look closer at why it is not changing to 1!

Look at your two examples that do work, and compare what's happening with the one that doesn't work.

"What,s the reason behind it"

There is a bug (or bugs) in your software that you just happen to get away with for the KIGNSTON 8 GB, SANDISK 4 GB pendrives, but your luck runs out with the the HP drive.

This is the big difference between just trying something a couple of times and saying, "it works" - and fully testing it to ensure that it complies with all conditions and requirements!

Either the thumb drives are differently formatted and that trig some issue.

Or there is a difference between they have different power requirements.

Or they may have different timing requirements.

Step 1 is to debug.
And the lovely thing is that you have a situation where different memories gives different results - that is very good, because then you can compare. If none of the memories had worked, you would have had a way harder problem to fight.

CAN BE THE BUG IN THUMB DRIVE. LIKE LOTS OF SD CARDS HAVE BAD TIMINGS AND STUFF.

And the lovely thing is that you have a situation where different memories gives different results - that is very good, because then you can compare.
lucky you, this means that you can debug your way backwards to find the actual place where the difference originates.

Erik

DON'T SHOUT!

Even if it is a bug in the HP drive, you said yourself that the PC accommodates it!

Far more likely a bug in your firmware.

www.catb.org/.../smart-questions.html

No, no, no no.

Lots of SD cards have not bad timings and stuff.

It is far more likely that lots of card reader software have bad timings and stuff.

Why else is almost all cards working when used in a PC, while lots of embedded equipment (MP3 players, cameras, data loggers etc) have issues with some cards?

If you think that maybe more time was invested in testing for the PC products, then you are close - real close - to the correct answer.

Too much embedded equipment gets released after having been tested with 3-4 different memory cards.

But when you buy memory cards, they are sold in many different speed classes. These speed classes obviously do affect how the card can be used...

Depending on flash type, and number of parallel flash memory chips, they will have different transfer rates. Different cards can also have different flash controllers. The standard do specify limits for timings of different signals - but normally only in one direction.

And there are also many different ways you can legally format a memory card - even two cards of same size. You can have one or two FAT tables. You can have different offset of root directory. You can have different number of root directory entries. You can have different sector size. Different cluster size. With partition table or without.

There are lots of parameters in the master boot record that can be optionally configured differently - and the reading firmware needs to learn to support these differences.

today my pastor said "The PC in church can not read my power point on this pen drive" I said "Is it a HP stick" he replied "yes".

My best guess is that USB is becoming the new RS-232 where the manufacturers (or developers) save a penny by ignoring the specs and just state "this solution works with most".

Thus a HP stick that is 'just' within specs will not work on units that do not (in some respect) TOTALLY adhere.

It would be extremely interesting if the OP (or someone else) would diagnose this fully and find which end of the stick is wrong.

It may, of course. also be that by leaving HP sticks by the wayside, you gain some speed.

Erik

But when you buy memory cards, they are sold in many different speed classes. These speed classes obviously do affect how the card can be used...

True. But rogue cards almost do certainly occur. A while ago I had a collection of same supplier, same part number cards and found that two of that collection failed to work in various pieces of kit. Not just equipment that I had involvement in. They would even fail in some card readers but not others.

Lots of manufacturers buys batches of components when they build cards. So if you buy same article number, you can get totally different contents inside every time you buy.

They should all be working - if the manufacturer isn't directly stupid - but will very different specifications. Some fast, some slow. Some supporting many rewrites, some supporting few. Some having huge tolerances for supply voltages, while some needing very close to 5V.

Quite few card manufacturers have own flash manufacturing or buy same memory chips all the time from the same manufacturer.

Thanks Sir for your kind support

Sir I think you are right because sometimes when i Format HP pendrive from PC. it starts working and worked after this at my board.