Does pendrive becomes slow if it is formatted regularly?  

ya formatting is not good.. pen drive(Flash Memory) has limited write(~1 million) after that it looses its ability to store data.. flash memory has internal circuitry that ensures that same black is not write all the times , so if you format which is nothing but writing zero's into whole of the flash memory even the one's that dint have any data and thus will decrease its life and also reduce the write and read speed as internal circuitry will take time to check which block is not written many times...

Hope this was helpfull..

yep thats true..
Regularly formatting pendrive can damage your pendrive. If you format it regularly its internal chips get damaged and it response time usualy increases due to which generally become slow and often corrupt the data contained in it..
So dont regularly format your pendrive.Formatting pendrive once a month is OK.

And you said your pendrive has become slower than before!!!!
If its still in warranty (or is about to expire) try formatting your pendrive as many times as you can. By doing this ur pendrive would get damaged and you will get it replaced with a NEW ONE. :-)
Tried with mine and got a new one!!!!!

I have been using my pendrive for 2 years. I formatted only 2-3 times. I think this may be the reason that I did not observe any change in copying speeds.

After reading the responses, I came to know that it will be damaged if you format it many times.

I also like to know what is the maximum number of formats we can do without causing damage to the pendrive.

I don't understand the term speed of the pen drives here.It don't have any processor to process our data. If you mean storing the data and retrieving them, then these depends on our computers where we are using our pen drives.I don't think the formatting will cause any damage to the pen drive or slowdown of pen drives. All the memory devices are having its own life.Even if you don't format them, we can not use them for a long.But improper removal from the computer is causing the data loss only .Some time, if we switch on the computers,with the pen drives inserted already, is damaging the pen drives entirely as the sudden excessive voltage affect pend drives, while switch on the computers.

I don't understand the term speed of the pen drives here.It don't have any processor to process our data. If you mean storing the data and retrieving them, then these depends on our computers where we are using our pen drives.I don't think the formatting will cause any damage to the pen drive or slowdown of pen drives. All the memory devices are having its own life.Even if you don't format them, we can not use them for a long.But improper removal from the computer is causing the data loss only .Some time, if we switch on the computers,with the pen drives inserted already, is damaging the pen drives entirely as the sudden excessive voltage affects the pen drives, while switch on the computers.

No dude we cant say that formatting a pendrive makes pendrive slow...minimum life of pendrive is 5 to 6 years and we can format a pendrive more number of times as u wish.u must take care of ur pen drive without making it to affect by virus...ur pen drive and ur pc ll be slow if ur pen drive is prone to trojan or virus..so scan ur pen drive regular using antivirus program and format it once in a month...

Hey,

Well I don't really know for sure but I think it does, I have no idea. Hopefully someone below me can answer your question much better than I have in a more informative way. Anywayz I wish you well, have a great day MyLotting!!