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Newbie
Posts: 3
Registered: ‎09-12-2011
Accepted Solution

Poor write speed ob 16GB cruzer

I am a long time fan of Sandisk products. I use them almost daily and highly recommend them, by name, to colleagues.  I see others are having performance issues also. Tech support and chat have not been any help. There 2 answers are..

1.Format the drive

2. Copy 1 file at a time

I've formatted the drive a few times to either FAT32 or NTFS. Makes no difference. I am a computer technician. When I use my flash drive, I copy whatever a customer needs and that may come in hundreds of files and folders. Copying one file at a time could take hours so this is not a reasonable suggestion. since my customers pay me hourly.

 

I could actually accept the answer that all 16GB cruzers are that slow but support won't comment on this. Does anyone know if this is a Sandisk only issue or are other brand's faster.

 

I would like to post my test results.

======================

Sandisk USB flash drive: sdcz36-016g  black bl1106wz0b
System: Dell Inspiron 531 desktop.
Specs: Windows 7 Home Premium 32bit will all updates,USB 2.0, AMD Athlon 64 X2 5000+, 3.5GB Memory.

Test-file: One folder containing 93 sub-folders, 407 files, total of 6.8GB.

Test1: Copy Test-file from Sandisk to C:\temp folder.
Stats and results: Speed was a steady 13.2MB/sec. Total time 8min 41 seconds.


Per Sandisk Tech support, I formatted the flash drive before Test2.
===============================================
Test2: Copy Test-file from C:\temp to Sandisk.
Stats and results: Speed constantly goes down. Intervals and speed readings follow.

Time interval        Speed in MB/s
1sec            40.8
1 min            10.8
2 min            7.17
5 min            4.93
10 min            4.18
15 min            3.98
20 min            3.90
25 min            3.82
30 min            3.76
32 min 37 sec        3.52 (finish)

Unbelievably slow!!!

SanDisk Guru
Posts: 4,370
Registered: ‎07-18-2007

Re: Poor write speed ob 16GB cruzer

this drive is an entry level device and no speed specs are published. typically you can expect 3 to 5MB/s which looks like what you are seeing. if you are interested in speed look at sandisk ultra or extreme line products. 

SanDisk Guru
Posts: 2,503
Registered: ‎07-23-2010

Re: Poor write speed ob 16GB cruzer

"Copying one file at a time could take hours"

 

"my customers pay me hourly."

 

So this is bad how??  Smiley Very Happy

Ed
Important files = Backed up files
SanDisk User
Posts: 34
Registered: ‎09-01-2011

Re: Poor write speed ob 16GB cruzer

[ Edited ]

The reason why its fast on the 1st min then suddenly fades away is that windows decreases its speed due to errors. When it detects an error, it needs to resend the data again, at the same time, increasing the window size. Until it goes to a stable speed. Check out "Windowing" in google. I agree, speed is ok. 

Newbie
Posts: 3
Registered: ‎09-12-2011

Re: Poor write speed ob 16GB cruzer

Yes it might also be a Windows issue but I've had similar results using the drive in Linux.

Newbie
Posts: 3
Registered: ‎09-12-2011

Re: Poor write speed ob 16GB cruzer

Thanks. That helps a lot.

Tech Support should have mentioned this but they did not.

SanDisk User
Posts: 34
Registered: ‎09-01-2011

Re: Poor write speed ob 16GB cruzer

There are free softwares that provides you a boost in copying data. Teracopy is one of them. You can check it out. i got 3 flash drives here, thy avaerage 3-4Mbps too. I wouldnt worry about it unless if you are tried to transfer enormous files. 

Newbie
Posts: 3
Registered: ‎09-23-2011

Re: Poor write speed ob 16GB cruzer

I also considered Sandisk as the clear market leader and always favoured Sandisk products over anything else given the choice. However, the Cruser Blade (8GB in my case) is an utter disappointment - it's slower even than the unbranded give-away sticks I got years ago! The suggestion to go "Ultra" for a comparable performance to the current generic junk is a poor excuse.

 

Clearly, Sandisk is not a blind choice any more.

 

SanDisk Guru
Posts: 16,127
Registered: ‎04-17-2008

Re: Poor write speed ob 16GB cruzer

People buy Cruzers for price. People buy Ultras for performance.

 

Which do you want?

 

 

Newbie
Posts: 3
Registered: ‎09-23-2011

Re: Poor write speed ob 16GB cruzer

[ Edited ]

I bought SanDisk for quality and expected performance at least in par with unbranded, cheaper alternatives. Obviously that's too much.