card reader

bjlockie · 09-30-2022, 06:04 PM

I have a card reader but it doesn't have an activity light.
It also doesn't show the name of the card that is inserted:

Quote:

[12146.997301] usb 2-1: Product: USB3.0 Card Reader
[12146.997303] usb 2-1: Manufacturer: Realtek
[12146.997305] usb 2-1: SerialNumber: 201404081410
[12147.029789] usb-storage 2-1:1.0: USB Mass Storage device detected
[12147.030039] scsi host2: usb-storage 2-1:1.0
[12147.030240] usbcore: registered new interface driver usb-storage
[12147.032712] usbcore: registered new interface driver uas
[12148.063596] scsi 2:0:0:0: Direct-Access Generic- USB3.0 CRW -SD 1.00 PQ: 0 ANSI: 6
[12148.071513] scsi 2:0:0:1: Direct-Access Generic- USB3.0 CRW -SD 1.00 PQ: 0 ANSI: 6
[12148.071892] sd 2:0:0:0: Attached scsi generic sg0 type 0
[12148.072156] sd 2:0:0:1: Attached scsi generic sg1 type 0
[12148.765620] sd 2:0:0:0: [sda] 7862272 512-byte logical blocks: (4.03 GB/3.75 GiB)

My USB hub reports the drive that is connected.

Would a newer reader report the devices?

frankbell · 09-30-2022, 07:56 PM

What precise kinds of cards are you trying to read? Prox cards, swipe cards, credit cards, or something else?

dugan · 09-30-2022, 07:59 PM

Considering that it's detected as a USB mass storage device? I would assume SD cards.

Is there actually a problem? Are the storage device nodes created? Can you mount them?

bjlockie · 09-30-2022, 11:42 PM

Quote:

Originally Posted by dugan

Considering that it's detected as a USB mass storage device? I would assume SD cards.

Is there actually a problem? Are the storage device nodes created? Can you mount them?

It works fine.
I just wondered if newer card readers show the underlying card manufacturer.

lvm_ · 10-01-2022, 10:09 AM

If you mean you'd like to read the card's CID then the answer is no, it cannot be done over USB, only over SPI.

bjlockie · 10-01-2022, 01:24 PM

I have USB 3 type A ports that I am going to get USB-C adapters for and then a USB-C card reader.
Do all the adapters support USB 3 or could I end up with USB 2 type C?

business_kid · 10-01-2022, 01:53 PM

There are USB-2.x & 3.x in Type A sockets. USB-3.x ones are blue, IIRC & usb-2.x ones are black. Is that what you're asking? Yes, you could end up talking to a type 2.x usb type A socket, but they will adjust speed down.

bjlockie · 10-01-2022, 03:46 PM

I have blue ones on the front of my case.
I want to buy type C adapters but I still want then to be USB3. :-)

business_kid · 10-02-2022, 04:49 AM

They will be USB-3.x. You'll have to go to the M/B handbook to find out what the 'x' actually is.

fatmac · 10-02-2022, 12:16 PM

The card reader will/should run at the speed of the USB socket.

business_kid · 10-03-2022, 04:46 AM

The big thing that controls the speed of an sdcard is not the hardware, but the caching. I was dd'ing disk images for my RazPi which were 5-10G each, and learned the ropes.

They'd start real fast, and the caching routine in the kernel originally used a % of the available ram as a cache. But Linus himself patched it to be smaller for some reason which I never got to the bottom of. By the end I'd be down to 12-15 MB/S, or close to the 150Mbps the usb-3.x in my old laptop was capable of. If you're box is good for more, by all means get your usb-c cables, and you'll discover what the next slowest limit is.

rnturn · 10-04-2022, 08:54 AM

Quote:

Originally Posted by frankbell

What precise kinds of cards are you trying to read? ... or something else?

Punch? :^D

(OK. I've gone and dated myself.)

bjlockie · 10-04-2022, 01:16 PM

MicroSD and/or SD.

sundialsvcs · 10-04-2022, 01:32 PM

"Bah!" That's not a "card reader!"

This is a card reader ...!

I know this because I actually used one ... (koff, koff)

TenTenths · 10-05-2022, 05:19 AM

Quote:

Originally Posted by sundialsvcs

"Bah!" That's not a "card reader!"

This is a card reader ...!

I know this because I actually used one ... (koff, koff)

Off Topic: At one place I had to boot a machine off paper tape to make it recognise the floppy drive.