Microsoft KB Archive/141905

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MAC Speed Doubler Extension Can Cause B-Tree Errors
'Article ID: Q141905

Creation Date: 31-DEC-1995

Revision Date: 22-APR-1996' The information in this article applies to:


 * Macintosh System Software

SYMPTOMS

When you use Connectix MAC Speed Doubler extension, you may experience B- tree errors.

CAUSE

The Speed Access extension of Speed Doubler 1.0.x causes a problem that may result in specific types of B-tree catalog errors. The way the problem occurs is complex: it only exists during an unlikely combination of certain file system calls that cannot be generated on demand. Furthermore, the problem results in a specific type of catalog B-tree error; a disk utility (such as Symantec Norton Disk Doctor) cannot distinguish the type of error generated by Speed Access from any other type of catalog B-tree error.

RESOLUTION

If you are currently using Speed Access 1.0.x, you should disable it and update to version 1.1.

MORE INFORMATION

Below is information obtained directly from the Connectix Web site at #|http://www.connectix.com:

Speed Doubler 1.1 Updater FAQ (Frequently Asked Questions) 12/8/95

IMPORTANT: We are in the process of updating all our Speed Doubler customers to version 1.1. We have discovered a problem in the Speed Access extension of Speed Doubler 1.0.x, that can in certain, uncommon circumstances, damage disk directory information. Although the problem is unlikely to occur, we recommend all Speed Doubler users update to version 1.1, which does not have this problem. This improved version incorporates a number of performance and compatibility enhancements including a solution to the directory information issue. If you are a Speed Doubler registered user, a 1.1 floppy is being mailed to you. If you have access to an online service the 1.1 updater is currently posted.

QUESTION: How do I get Speed Doubler 1.1?

ANSWER: If you are a Speed Doubler registered user, a 1.1 floppy is being mailed to you. If you have access to an online service you can download the 1.1 updater immediately from the following online locations:

World Wide Web - #|http://www.connectix.com America Online - keyword = Connectix: Software Library CompuServe - GO MACAVEN, Section 8 Library eWorld - shortcut = Connectix: Software Library AppleLink - Third Parties: A-C: Connectix: Software Library

QUESTION: What problem is fixed by Speed Access 1.1?

ANSWER: Speed Access 1.1 fixes a problem that could result in a specific types of B-tree catalog error. The way the problem occurs is rather complex: It only exists during an unlikely combination of certain file system calls that cannot be generated on demand. Furthermore, the problem results in a specific type of catalog B-tree error; a disk utility (such as Symantec Norton Disk Doctor) cannot distinguish the type of error generated by Speed Access from any other type of catalog B-tree error.

QUESTION: What is the 'catalog B-tree'?

ANSWER: The catalog B-tree is part of the disk directory. It is the structure that has an entry for every file and folder on the disk. It is responsible for assuring that the location and size of the files are known. The nature of the Speed Access 1.0.x bug is that file location information becomes out of order - individual file contents are not altered.

QUESTION: How do I know if I'm having a problem with my catalog B-tree?

ANSWER: Run a disk utility such as Disk First Aid, Symantec Norton Disk Doctor, or Symantec Mac Tools Pro. In general, Catalog B-tree errors are a common type of disk directory error and are recognized by every major disk utility.

In nearly all cases, a disk utility can repair a catalog B-tree error. However, the disk utility cannot determine if a catalog B-tree error is related to Speed Access 1.0.x or to any other problem.

REFERENCES

Speed Doubler is manufactured by Connectix, a vendor independent of Microsoft; we make no warranty, implied or otherwise, regarding this product's performance or reliability.

For more information about Connectix Speed Doubler, contact Connectix:

Connectix 2600 Campus Drive San Mateo, CA 94403-2520 Telephone: (800) 950-5880 or (415) 571-5100 FAX:      (415) 571-5195
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