Knoppix 7.0.4-EN CD & DVD notes & comments

[knopper]

Are SDXC flash memory cards supported by Knoppix 7.0.4?

Have recently acquired a Lexar Professional 400x 64GB SDXC fkash memory card for my camera, and discovered that neither Knoppix 7.0.2 nor Puppy Lupuplus 5.2.8 can mount this card either on my Toshiba’s internal SD slot, nor on the Delkin USB3.0 card reader connected to a pci-expressbus adapter. Both distributions are able to read and write older/smaller (8GB) SDHC cards on both external and internal readers.

In Puppy, the system was unable to detect the presence of the card in either position, while Knoppix displayed an icon for it in both locations, but could only display the label of the card “Nikon D800“, but not the size or the contents.
Worse, an 8GB CF card inserted in the USB3,0 reader, which is normally perfectly accessible from both Puppy and Knoppix could not be accessed either, even after the SDXC card was removed.

Windows 7 had no trouble reading the Lexar SDXC in either position. Using the internal slot, the files copied to the laptop’s hard drive at 21.4MB/s, and at 35MB/s using the USB3.0 connection.

Is there a fix in Knoppix 7.0.4?

Your description sounds to me as if the card is formatted with an ExFAT file system. This file system is supported first in Knoppix 7.0.4, so it may be worth a try.

Regards
-Klaus

[otropogo]

Your description sounds to me as if the card is formatted with an ExFAT file system. This file system is supported first in Knoppix 7.0.4, so it may be worth a try.

Regards
-Klaus

Hi Klaus. Good call! I installed 7.0.4, and was then able to read the 64GB SDXC card, but ONLY on the Toshiba's internal SD/XD slot and on the USB2.0 port.

(in 7.0.2, the response is )

Error mounting: mount exited with exit code 1: helper failed with:
mount: unknown filesystem type 'exfat'

When the card is inserted in the Delkin USB3.0 card reader attached to a Sabrent expressbus USB3.0 adapter, the card shows up in the file manager as 'D800' , and the mount/unmount tabs appear active, but when I try to mount it, a pop up appears and says:

Error mounting: mount exited with exit code 1:
helper failed with: ERROR :fsync failed

The same Delkin card reader also allows me to mount the SDXC card when attached to the USB2.0 port. It would seem to be an issue with the USB3.0 driver in the kernel.

I noticed that there seems to be an excess of storage devices listed in the file manager, both sdc1 and sdh, in addition to 'Knoppix' (presumably the usb flash device from which the OS is running) and 'D800' the label Nikon gives the flash card.

Clicking on sdc1 gives "medium not found". While with sdh, the response is "mount point does not exist". These two persist when the SDXC is ejected and removed.


So - definitely an improvement, but unfortunately, the transfer rate via the internal slot. is only half to a third that of the USB3.0 connection.

The USB2.0 port is even slower, of course.