Just now I found this KB article about "Availability of the Windows Vista Secure Digital (SD) hotfix rollup package".
The following issues are fixed in this hotfix package. These issues have not been previously documented in a Microsoft Knowledge Base article.
• When you try to remove an SD card driver or when you try to disable it, a Windows Vista-based computer stops responding. When this problem occurs, you receive a Stop error message that resembles the following: Stop 0x000000C4 (0x00000062,parameter2,parameter3,parameter4)
• When you insert an SD card into a card reader on a Windows Vista-based computer, Windows Vista does not detect the SD card. This issue occurs if the following conditions are true:
The SD card does not support 1.8 volts. Typically, most SD cards use 3.3 volts.
The SD host controller uses 1.8 volts.
• When you insert an SD card into the card reader on a Toshiba M500 portable computer that is running Windows Vista, Windows Vista does not detect the SD card. This issue occurs because of a timing issue with the SD host controller.
• When you copy more than 4 gigabytes (GB) of files to a Secure Digital High Capacity (SDHC) card, some files are corrupted. You do not experience this issue if you copy less than 4 GB of files to the SDHC card. This problem occurs because the Windows Vista SD driver does not correctly process more than 4 GB of addressing.
• An SD card stops responding after a Windows Vista-based computer resumes from sleep (S3) or from hibernation (S4) two times. For example, you experience this issue after you follow these steps:
1. You put the computer to sleep or into hibernation.
2. You start the computer from sleep or from hibernation.
3. You copy files to the SD card or from the SD card.
4. You put the computer to sleep or into hibernation
5. You start the computer from sleep or from hibernation.
• You try to use the Safely Remove Hardware feature to remove an SD card from a Windows Vista-based computer while the card is being used. As expected, the card is not removed from the computer because the card is being used. However, when you try to access the SD card, you receive the following error message: SD media cannot be accessed. Media is not accessible, access denied
• On a Toshiba M500 portable computer that is running Windows Vista, you use Device Manager to disable the "Bluetooth RFBUS from Toshiba" driver. However, when you re-enable the driver, Device Manager stops responding.
I am installing the hotfix now and will test it through the week to see if it really solves the problem.
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