但当我查看主文件夹时，它们出现在左侧部分，并且我拥有完全访问权限。看来我在尝试解决读卡器早期问题（现已修复）时造成了意想不到的后果。
当我单击卸载 USB 记忆棒或 SD/SDHC 卡时，系统要求我提供管理员密码！
我需要解决这种情况吗？如果需要，该怎么做？
谢谢
njsg，按要求终端输出，感谢您的耐心等待，
使用多卡读卡器中的 USB 记忆棒，
roger@roger-desktop:~$ mount
/dev/sda6 on / type ext4 (rw,errors=remount-ro)
proc on /proc type proc (rw,noexec,nosuid,nodev)
sysfs on /sys type sysfs (rw,noexec,nosuid,nodev)
none on /sys/fs/fuse/connections type fusectl (rw)
none on /sys/kernel/debug type debugfs (rw)
none on /sys/kernel/security type securityfs (rw)
udev on /dev type devtmpfs (rw,mode=0755)
devpts on /dev/pts type devpts (rw,noexec,nosuid,gid=5,mode=0620)
tmpfs on /run type tmpfs (rw,noexec,nosuid,size=10%,mode=0755)
none on /run/lock type tmpfs (rw,noexec,nosuid,nodev,size=5242880)
none on /run/shm type tmpfs (rw,nosuid,nodev)
none on /run/user type tmpfs (rw,noexec,nosuid,nodev,size=104857600,mode=0755)
binfmt_misc on /proc/sys/fs/binfmt_misc type binfmt_misc (rw,noexec,nosuid,nodev)
gvfsd-fuse on /run/user/roger/gvfs type fuse.gvfsd-fuse (rw,nosuid,nodev,user=roger)
/dev/sdf1 on /media/usb0 type vfat (rw,noexec,nodev,sync,noatime,nodiratime)
roger@roger-desktop:~$
roger@roger-desktop:~$ dmesg | grep sdf
[ 218.603341] sd 9:0:0:0: [sdf] 7806976 512-byte logical blocks: (3.99 GB/3.72 GiB)
[ 218.604450] sd 9:0:0:0: [sdf] Write Protect is off
[ 218.604455] sd 9:0:0:0: [sdf] Mode Sense: 23 00 00 00
[ 218.605449] sd 9:0:0:0: [sdf] No Caching mode page present
[ 218.605453] sd 9:0:0:0: [sdf] Assuming drive cache: write through
[ 218.610441] sd 9:0:0:0: [sdf] No Caching mode page present
[ 218.610448] sd 9:0:0:0: [sdf] Assuming drive cache: write through
[ 218.637917] sdf: sdf1
[ 218.643388] sd 9:0:0:0: [sdf] No Caching mode page present
[ 218.643396] sd 9:0:0:0: [sdf] Assuming drive cache: write through
[ 218.643401] sd 9:0:0:0: [sdf] Attached SCSI removable disk
roger@roger-desktop:~$
使用多卡读卡器中的 USB 记忆棒和 SDHC 卡，
roger@roger-desktop:~$ mount
/dev/sda6 on / type ext4 (rw,errors=remount-ro)
proc on /proc type proc (rw,noexec,nosuid,nodev)
sysfs on /sys type sysfs (rw,noexec,nosuid,nodev)
none on /sys/fs/fuse/connections type fusectl (rw)
none on /sys/kernel/debug type debugfs (rw)
none on /sys/kernel/security type securityfs (rw)
udev on /dev type devtmpfs (rw,mode=0755)
devpts on /dev/pts type devpts (rw,noexec,nosuid,gid=5,mode=0620)
tmpfs on /run type tmpfs (rw,noexec,nosuid,size=10%,mode=0755)
none on /run/lock type tmpfs (rw,noexec,nosuid,nodev,size=5242880)
none on /run/shm type tmpfs (rw,nosuid,nodev)
none on /run/user type tmpfs (rw,noexec,nosuid,nodev,size=104857600,mode=0755)
binfmt_misc on /proc/sys/fs/binfmt_misc type binfmt_misc (rw,noexec,nosuid,nodev)
gvfsd-fuse on /run/user/roger/gvfs type fuse.gvfsd-fuse (rw,nosuid,nodev,user=roger)
/dev/sdf1 on /media/usb0 type vfat (rw,noexec,nodev,sync,noatime,nodiratime)
/dev/sdb1 on /media/usb1 type vfat (rw,noexec,nodev,sync,noatime,nodiratime)
roger@roger-desktop:~$
roger@roger-desktop:~$ dmesg | grep sdf
[ 218.603341] sd 9:0:0:0: [sdf] 7806976 512-byte logical blocks: (3.99 GB/3.72 GiB)
[ 218.604450] sd 9:0:0:0: [sdf] Write Protect is off
[ 218.604455] sd 9:0:0:0: [sdf] Mode Sense: 23 00 00 00
[ 218.605449] sd 9:0:0:0: [sdf] No Caching mode page present
[ 218.605453] sd 9:0:0:0: [sdf] Assuming drive cache: write through
[ 218.610441] sd 9:0:0:0: [sdf] No Caching mode page present
[ 218.610448] sd 9:0:0:0: [sdf] Assuming drive cache: write through
[ 218.637917] sdf: sdf1
[ 218.643388] sd 9:0:0:0: [sdf] No Caching mode page present
[ 218.643396] sd 9:0:0:0: [sdf] Assuming drive cache: write through
[ 218.643401] sd 9:0:0:0: [sdf] Attached SCSI removable disk
roger@roger-desktop:~$
请注意，上面的方括号中的 sdf 在终端中是红色的。
对于 USB 记忆棒和 SDHC 卡，我都可以读取并复制到我的 PC，但我无法从 PC 写入它们。使用 Ubuntu 主文件夹、设备、属性，两者都有 msdos 文件系统。当我将它们插入 Windows XP 笔记本电脑时，它们都是 FAT32 文件系统。这是否意味着 Ubuntu 将 FAT32 视为 msdos？