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Difference between revisions of "Working with Scanners with Secure Digital (SD) Cards"

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==General Tips and Information==
 
==General Tips and Information==
;Many of you have questions about Boot/Load times of the Whistler SD card scanners
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;Many of you have questions about Boot/Load times of the GRE/RS/Whistler microSD card scanners
**At boot, the code looks through the entire File Allocation Table, counting “free” clusters. This is necessary so that we know how much free space is available on the card at startup. The number of clusters that must be counted is directly related to the size of the card. As a result, a change in card capacity at a minimum will impact the “Init SD FileSys” time. In addition to card size, the “Verifying Data” time is dependent on the usage of the card and is heavily dependent on file system fragmentation, used space, etc. ''Thanks WhistlerWendy''
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*At boot, the code looks through the entire File Allocation Table, counting “free” clusters. This is necessary so that we know how much free space is available on the card at startup. The number of clusters that must be counted is directly related to the size of the card. As a result, a change in card capacity at a minimum will impact the “Init SD FileSys” time. In addition to card size, the “Verifying Data” time is dependent on the usage of the card and is heavily dependent on file system fragmentation, used space, etc. ''Thanks WhistlerWendy''
  
  

Revision as of 10:23, 23 January 2018

Welcome to scanners with microSD cards article. This page on Secure Digital cards from Wikipedia has a great deal of useful information and explanations on the various terms. If a particular tip is specific to a particular model, please be sure to mention that in the description. Details Matter - the more details you supply, the better this article will become. This article should be a repository for hints, tips, known issues and fixes regarding: use, formatting, loading and other issues that involve scanners utilizing Secure Digitals - microSD cards:

GRE Radio Shack Uniden Whistler
PSR-700 Pro-18 HP-1 WS1080
PSR-800 Pro-107 HP-2 WS1088
Pro-668 BCD436HP WS1095
Pro-668 BCD536HP WS1098
TRX-1
TRX-2



General Tips and Information

Many of you have questions about Boot/Load times of the GRE/RS/Whistler microSD card scanners
  • At boot, the code looks through the entire File Allocation Table, counting “free” clusters. This is necessary so that we know how much free space is available on the card at startup. The number of clusters that must be counted is directly related to the size of the card. As a result, a change in card capacity at a minimum will impact the “Init SD FileSys” time. In addition to card size, the “Verifying Data” time is dependent on the usage of the card and is heavily dependent on file system fragmentation, used space, etc. Thanks WhistlerWendy


My microSD Card has failed or I want to replace it with a larger capacity secondary card, or make a back-up card. What microSD cards are compatible? Generally, How do I format the microSD card for use?
  • Some types and/or brands of microSD cards, up to 32GB, are supported. For GRE/RS/Whistler as long as it is formatted correctly:
    • 2GB or smaller: FAT16, 32kB clusters
    • larger than 2GB: FAT32, 32kB clusters
    • SanDisk and Transcend cards from Class 2 to 6 and up to 32 GB are known to work correctly. Some 4 GB PNY cards have worked while others have not. Other brands have been known to cause issues and could not be recognized by the GRE/RS/Whistler PC based OOS.
    • Larger capacity memory cards (16-32 GB) have been reported to take longer for the GRE/RS/Whistler PC based OOS to read, boot up and become operational.
    • The SD association recommends using their SD memory card format tool. They say Windows does not properly format SD cards. Their tool can be found here


Related Pages

Replacement SD Cards Thread