Linux - HardwareThis forum is for Hardware issues.
Having trouble installing a piece of hardware? Want to know if that peripheral is compatible with Linux?
Welcome to LinuxQuestions.org, a friendly and active Linux Community.
You are currently viewing LQ as a guest. By joining our community you will have the ability to post topics, receive our newsletter, use the advanced search, subscribe to threads and access many other special features. Registration is quick, simple and absolutely free. Join our community today!
Note that registered members see fewer ads, and ContentLink is completely disabled once you log in.
If you have any problems with the registration process or your account login, please contact us. If you need to reset your password, click here.
Having a problem logging in? Please visit this page to clear all LQ-related cookies.
Introduction to Linux - A Hands on Guide
This guide was created as an overview of the Linux Operating System, geared toward new users as an exploration tour and getting started guide, with exercises at the end of each chapter.
For more advanced trainees it can be a desktop reference, and a collection of the base knowledge needed to proceed with system and network administration. This book contains many real life examples derived from the author's experience as a Linux system and network administrator, trainer and consultant. They hope these examples will help you to get a better understanding of the Linux system and that you feel encouraged to try out things on your own.
Click Here to receive this Complete Guide absolutely free.
I own 3 SanDisk 4GB Titanium USB flash drives. SanDisk claims a max write rate of 9 MB/s. Under a variety of tests (FAT32 AND Linux ext3 formats), I do indeed achieve results that are very close in writing 100MB files.
I just purchased another SanDisk Titanium flash drive identical in specs except that it was 8GB capacity. Running all the same tests as with the 4GB versions, I obtained write speeds more than 4 times slower! It thought the unit was defective so I returned it.
I then bought a Corsair Voyager GT, 16GB; various reviews on the web have reported write rates near the USB 2.0 bus limit; ie, 30 MB/s. Once again, I ran many tests with different formats. The results were shocking with write speeds near 1 MB/s; that is almost an order of magnitude worse than my SanDisk 4GB drives.
Clearly, both the new 8GB & 16GB drives are NOT defective. I am absolutely clueless what is happening. USB flash drives 4GB or smaller function at their manufacturer's promised ratings while any drive larger than 4GB falls far short.
Can anyone explain this? Has anybody observed this?
I am running Slackware 13.0 32 bit version with the latest kernels, 184.108.40.206 & 220.127.116.11 on a Lenovo R61e with 2GB ram. In reading logs, proc files, sys, etc, I find no hint of trouble.
Maybe there's some issue with the filesystem?
I think that the first test you should do, is by running "hdparm -tT" against your disks. This should be independent of the particular filesystem.
Then, when making tests by file transfer, first check if the disk has been mounted with some special option.
The "sync" option, for instance, has a terrible effect on disk performance. All writes should be "async" instead.
Also, be sure to always use the same USB port when running these test. Many PCs have mixed USB1.1 and USB2.0 ports.