sandisk not very reliable... unconsistent reading

[alamakazim]

sandisk not very reliable... unconsistent reading

I have a few thumb drive and some microsd cards

problem like

some usb port cannot read..

any similar experience?

like
sansa cruze blade - can detect but write for 20%... device disappear
cruzer glide - computer not detecting

class 4 microsd - Samsung S3 not detecting, computer not detecting, yet camera can detect
cruzer pop - some laptop cannot detect

 

[jtjt00]

Be specific, give detail as to which Sandisk model having problem.

 

[mrsun18]

These are classic symptoms of poor/inconsistent contacts between the thumb/flash drives and devices, and betwen sd/micro sd and card readers/devices.

Cards and flash/thumb drives have no mechanical moving parts. They are so reliable that most makers, if not all, give lifetime warranties.

This wiki section gives more info on the durability of usb ports and connectors: Universal Serial Bus - Wikipedia, the free encyclopedia

Same logic applies for the sd/micro sd card interface.

Edit: My axioo notebook card reader "gave up" during the warranty period. I did not bother to get warranty service as it was not worth the effort. That was more than a year ago. Today, after reading your post, I inserted a fairly new scandisk sd card into the card reader. Bingo, after a few tries, it worked.

 

[alamakazim]

These are classic symptoms of poor/inconsistent contacts between the thumb/flash drives and devices, and betwen sd/micro sd and card readers/devices.

dont think so... some are new items... I also using new motherboard with a new extension cable

 

[jtjt00]

Try direct plug in into motherboard USB port. Extension cable maybe the cause.

 

[alamakazim]

Try direct plug in into motherboard USB port. Extension cable maybe the cause.

all my ports the same... usb 2.0 or 3.0 same .. connect to usb hub also same

asrock H77 Pro4/MVP

just tried reinstall drivers and update bios, still same

very weird...

this sansa cruze blade 32gb write 1.5~2gb will disappear

but I try at laptop no problem... feel up 1/2 no problem..

now trying some bios setting

 

[Gribber]

sandisk not very reliable... unconsistent reading

I have a few thumb drive and some microsd cards

problem like

some usb port cannot read..

any similar experience?

like
sansa cruze blade - can detect but write for 20%... device disappear
cruzer glide - computer not detecting

class 4 microsd - Samsung S3 not detecting, computer not detecting, yet camera can detect
cruzer pop - some laptop cannot detect

my 2xblade also like that

but my extreme 1 bo issue. So i think 1cent $ 1 cent goods.. but still.. the blade suck don't even worth a cent

my ultra sd card x 3 no issue.

 

[watzup_ken]

I had a Sandisk SDHC CLass 4 16GB card that died, after I removed it from my tablet. I think as the prices goes down, not surprise that there will be some serious reliability issues. Anyway, at less than 15 bucks, no reason for me to take a cab down to fix it. The cab fair will cost me more than the cost of the SD card...

 

[alamakazim]

Amazon.com: Customer Reviews: SanDisk Cruzer Glide 128 GB USB Flash Drive SDCZ60-128G-B35

 

[cscs3]

So far did not have problem with sandisk.

 

[alamakazim]

is a luck thing and different computer/laptop have different experience

I intensively tested on my HP laptop.. it works perfectly

From Amazon

I bought these two 32 GB Sandisk flash drives so I could store my MP3 files on them. I have a Windows 7 system. I also have over 20 other flash drives that I store information on. I have moved information from my hard drives onto these other (Kingston, Corsair, etc.) flash drives with no problems at all. When I began to load the MP3's onto the Sandisk flash drives using Windows Explorer, it would only load a small amount. Then, it would say the drive doesn't exist and what files I did manage to get on the Sandisk flash drives disappeared! I had to format the drive once it could be "seen". I tried several different ways to load information onto the Sandisk. This is the second worst purchase I have ever made at Amazon. They may do well in the pots and pans department but electronics and computer related items is not their strong point.

on my PC
it seems like it can only copy small batches of files, I copy about 4gb... only copy until 1-2gb then disappear

I also cant say my usb port is malfunctioning, because the accessories all are working, mouse, soundcard, DAS....


tonight I shall try copy small batches or maybe use a file commander software to copy



*dont u just hate lousy hardware*

 

[limster]

My phone, camera, GPS, Car DVR use sandisk cards. No problem even though GPS/DVR in car in hot sun almost every day. Even my ancient 1Gb Sandisk ultra still working.

Out of 6 sandisk usb drives, 1 has failed.

So overall, I will still buy sandisk.

Amazon probably sells thousands of sandisk card. So if only 1 complaint per 1000 sales, thats 0.1% failure rate....

 

[mrsun18]

is a luck thing and different computer/laptop have different experience

I intensively tested on my HP laptop.. it works perfectly

From Amazon


on my PC
it seems like it can only copy small batches of files, I copy about 4gb... only copy until 1-2gb then disappear

I also cant say my usb port is malfunctioning, because the accessories all are working, mouse, soundcard, DAS....


tonight I shall try copy small batches or maybe use a file commander software to copy



*dont u just hate lousy hardware*

I share your spirit of digging to find out the root cause of the problem.

As you have found out, the sandisk worked perfectly for your hp laptop . And your usb port (I assume it is the same port) worked for other accessories but it had problem for the sandisk.

As the saying goes, it takes two to tango, or two hands to clap. My analysis of poor/inconsistent contacts is still valid. Let me explain further.

The very nature of data transfer requires good, if not perfect connectivity. Production qualities cannot be 100% perfect. There will be tolerance. Slight variation in dimensions may result in degraded connectivity.

You have also noted data transfer was good only for small files. For larger files, it stopped after 1~2 gb. I can explain this was caused by the heating effect of the most minuscule current, which resulted in further deterioration of the less than ideal contacts.

So even if the two parts worked when partnered with other devices, they may not work properly together.

Do let us know if you have further findings.

Cheers.

 

[mrsun18]

...

Out of 6 sandisk usb drives, 1 has failed.

...

We are trying to figure out why the 1 failed...some kind of academic exercise, I suppose. That's how makers improve their products.

 

[alamakazim]

I share your spirit of digging to find out the root cause of the problem.

As you have found out, the sandisk worked perfectly for your hp laptop . And your usb port (I assume it is the same port) worked for other accessories but it had problem for the sandisk.

As the saying goes, it takes two to tango, or two hands to clap. My analysis of poor/inconsistent contacts is still valid. Let me explain further.

The very nature of data transfer requires good, if not perfect connectivity. Production qualities cannot be 100% perfect. There will be tolerance. Slight variation in dimensions may result in degraded connectivity.

You have also noted data transfer was good only for small files. For larger files, it stopped after 1~2 gb. I can explain this was caused by the heating effect of the most minuscule current, which resulted in further deterioration of the less than ideal contacts.

So even if the two parts worked when partnered with other devices, they may not work properly together.

Do let us know if you have further findings.

Cheers.

I disagree with contacts...

firstly is a new thumb drive

2ndly I have use different ports on my pc and different extension cable and even a USB hub

3rd is a new motherboard

4th my usb ports are not faulty, my usb hub, DAS, sound card all are working properly

5th lets say is thumb drive faulty.... why my 2 years old laptop can read/write as normal?

6th look at the reviews, amazon buyers give.. quite a number...

 

[mrsun18]

I disagree with contacts...

firstly is a new thumb drive

2ndly I have use different ports on my pc and different extension cable and even a USB hub

3rd is a new motherboard

4th my usb ports are not faulty, my usb hub, DAS, sound card all are working properly

5th lets say is thumb drive faulty.... why my 2 years old laptop can read/write as normal?

6th look at the reviews, amazon buyers give.. quite a number...

I understood what you said and took care to repeat what you said to make sure there was no misunderstanding. Some said they had no problem while some said they had. I believe you have also read and understood what I said. I tried to explain why the problem happended in a microscopic view. It is perfectly alright if you disagree with my explanations. I just hope that you will eventually find an explanation for the weird situation, as you said.

Anyway, one last try...I wonder if you ever heard of dry joint... Two parts that were soldered together should be electrically continuous but found not continuous on testing. It could be caused by dry joint.

 

[alamakazim]

I understood what you said and took care to repeat what you said to make sure there was no misunderstanding. Some said they had no problem while some said they had. I believe you have also read and understood what I said. I tried to explain why the problem happended in a microscopic view. It is perfectly alright if you disagree with my explanations. I just hope that you will eventually find an explanation for the weird situation, as you said.

Anyway, one last try...I wonder if you ever heard of dry joint... Two parts that were soldered together should be electrically continuous but found not continuous on testing. It could be caused by dry joint.

lets say is thumb drive faulty.... why my 2 years old laptop can read/write as normal?

lets say my pc usb port got problem... why all my other usb devices work?

which means there is no contact problem on the thumb drive and PC

 

[uncle168]

u can try other brands like kingston

maybe sandisk 8 charactor and yours don't match

i think most probably is the length of extension cable, the longer the more likely cannot detect, but if connect directly to MTB port should be ok, think longer more lost of power so cannot detect

i use sandisk and kingston both no problem for the past 15 years

keekeekee

 

[mrsun18]

lets say is thumb drive faulty.... why my 2 years old laptop can read/write as normal?

lets say my pc usb port got problem... why all my other usb devices work?

which means there is no contact problem on the thumb drive and PC

As I said before, I clearly understood what was your situation. What you have written in this latest post is just repeating what you have said before in a different way - all pretty well presented. Guess I have failed to communicate in a way that you can understand. I suppose a sketch or picture may help to explain it better. But I am not going to spend more time on it - as I said before - my last try.

Cheers and keep on puzzling.