i don't know if a card reader counts as a hard drive..
but i have questions as following:

i bought a new flash drive and brought it to work today.. and it was named as D drive..
and i need to use my card reader and plugged in ... it got 4 drives in it..
but at the time i connected the flash drive to the computer, the card reader could only show 3 of them...
i tried to unplugged the flash drive and restart the computer..
but the 4th drive would never comes out again..
why is it happening..
and what i can do...?

Card reader is considered a removable storage drive.

Are you sure the forth drive is working?  Have you tried it on other computers?

And try to place a memory card in the forth drive and see if the forth drive got recgonized.

Hope that helps.

actually it works the day b4 i bought and used the flash drive...
i just want to transfer files from my MS card to the flash drive.. so i tried to keep both of them plugin to the laptop

It must be something to do with how Windows assigns drive letters to USB device.  I would like to learn more about that too.  Why don't you turn your thread into a X-Seek thread and see if others will provide more info?

ultraegg :
咁簡單無轉做X-Seek呀!

明日可以貼圖作為參考!

芬姨, 妳個情況係driver letter出錯!

理論上, 所有usb device都由windows自行assign driver letter, 但妳都知microsoft的產品有幾咁"好", 所以傻o左都唔奇.

妳可以試先connect flash drive, 行得走得後先裝card reader. 如果真係唔得, 只好自行assign driver letter.
1. control panel 內的 system admin tools
2. system management -> disk management

right click flash drive就可以改driver letter啦!

If you cannot see all 4 drives, may be one of the slot get burn out.  Before you unplug the flash drive and card reader, did you use "safely remove hardware"?

but the card reader can still detect that i've input the MS card into the slot.. just that it's not showing in "my computer"
and yes as well.. i always uses safely remove hardware

may be the sercurity problem.. and i couldnt change the name of the flash drive... and actually i tried that yesterday.. i plugged the flash drive first.. then the card reader..
the 4th drive didnt come out..
and i tried to unplug all.. and only plugin the card reader..
the 4th drive still didnt come out..

ultraegg :
只係用其中一樣就無事? 妳用公司部laptop? login 公司network時用flash drive同card reader? 除o左c: 外, 重有其他driver letter??

ultraegg :
只係用其中一樣就無事? 妳用公司部laptop? login 公司network時用flash drive同card reader? 除o左c: 外, 重有其他driver letter??

no ar... the 4th drive disappeared... just that when you put the MS card in the slot.. the light of that slot in the card reader lights up.. but it doesnt show up in my computer...
yea.. there are other drives..

妳個情況好大機會係同其他driver letter撞o左! 但妳用緊公司laptop又麻煩少少. 建意妳login local/workstation only(即係唔login 公司個network), 咁會見到晒card reader同flash drive

真係要改driver letter的話, 步驟如下, 但改公司network driver letter可能令妳部laptop其他application有問題, 要小心處理.