我这里有一个 128GB 的 USB 3.0 闪存驱动器，现在不能用了。当我插入它时，它需要很长时间才能安装，而“永远”意味着它最终无法安装。
使用终端时，我收到以下错误消息：
$ diskutil eraseDisk JHFS+ TEST123 /dev/disk4
Started erase on disk4
Unmounting disk
Error: -69877: Couldn't open device
和这个：
$ diskutil verifyVolume /dev/disk4
Error starting file system verification for disk4: Invalid request (-69886)
此棒用于带有 USB 连接器的 Yamaha 接收器，以播放 MP3。它仍能看到文件夹，但当我尝试打开包含音乐文件的文件夹时，它显示“访问错误”。
我只想格式化磁盘。磁盘上的内容无关紧要。我该如何操作？
更新
Diskutil 修复结果如下：
Repairing file system.
Volume is already unmounted.
Performing fsck_msdos -y /dev/rdisk6s1
** /dev/rdisk6s1 (NO WRITE)
could not read boot block (Resource busy)
File system check exit code is 8.
Restoring the original state found as unmounted.
File system verify or repair failed.
Operation failed…
并按照要求：
$ sudo dmesg
Controller][TransportRadioPowerOff] -- returns kIOReturnError because Radio Power State = Powered Off -- inOpCode = 0xFCE9 (Broadcom VSC -- LE Meta VSC), From: Unknown (255), mNumberOfCommandsAllowedByHardware is 1, requestPtr = 0x2000
Sandbox: 6 duplicate reports for fseventsd deny(1) file-read-metadata /private/var/folders/81/ntbxxvv526gdxxfn_3sdtczm0000gn/0/com.apple.LaunchServices.dv****[BroadcomBluetoothHostController][TransportRadioPowerOff] -- returns kIOReturnError because Radio Power State = Powered Off -- inOpCode = 0x200E (LE Create Connection Cancel), From: Unknown (255), mNumberOfCommandsAllowedByHardware is 1, requestPtr = 0x2000
en0: DAD complete for fe80:5::4aa:1364:58c1:444 - no duplicates found.
en0: DAD complete for 2001:982:78ca:1:1ca1:4e07:4b5d:444c - no duplicates found.
en0: DAD complete for 2001:982:78ca:1:b9c8:4f88:af8d:e3a8 - no duplicates found.
AppleCamIn::handleWakeEvent_gated
IOConsoleUsers: time(1) 1534713791->1534713791, lin 1, llk 1,
IOConsoleUsers: gIOScreenLockState 3, hs 0, bs 0, now 1534755779, sm 0x0
IOConsoleUsers: time(0) 1534713791->0, lin 1, llk 0,
IOConsoleUsers: gIOScreenLockState 1, hs 0, bs 0, now 0, sm 0x0
AppleKeyStore: operation failed (pid: 92 sel: 75 ret: e00002ce '-536870194', -1, 100000)
utun_ctl_connect: creating interface utun1 (id utunid1)
utun1: attached with 0 suspended link-layer multicast membership(s)
RTC: setGMTTimeOfDay 1534755779
AppleCamIn::handleWakeEvent_gated
Sandbox: 1 duplicate report for fseventsd deny(1) file-read-metadata /private/var/folders/81/ntbxxvv526gdxxfn_3sdtczm0000gn/0/com.apple.nsurlsessiond/5C191B41B85964975463638FAD57F73CB1F3418D/5C191B41B85964975463638FAD57F73CB1F3418Dcom.apple.p2p: updateLocalRequests[10360] : AWDL will be turned ON by \^Ad\^A4\^Ae\^A2\^A1\^Af\^Ae\^Af\^Af\^Af\^A6\^A8\^A8\^Aa\^A0\^Ac\^A0\^A0\^A0\^A0\^A0\^A0\^A0\^A0\^A0\^A0\^A0\^A0\^A0\^A8\^Ae\^Af\^Cip6\^Darpa PTR browse, Called from mDNSResponder (pid 184)
Sandbox: 1 duplicate report for fsavd deny(1) file-read-metadata /private/var/db/ConfigurationProfiles/Store/ConfigProfiles.binarycom.apple.p2p: IO80211AWDLPeerManager::setAwdlOperatingMode Setting the AWDL operation mode from AUTO to SUSPENDED
com.apple.p2p: AWDL is suspended
com.apple.p2p: IO80211AWDLPeerManager::setAwdlOperatingMode Setting the AWDL operation mode from SUSPENDED to AUTO
com.apple.p2p: AWDL is off
Sandbox: fseventsd(56) System Policy: deny(1) file-read-metadata /private/var/folders/81/ntbxxvv526gdxxfn_3sdtczm0000gn/0/com.apple.LaunchServices.dvFB0: Complete modeset
Starting poll type 4
Restarting poll type 4
Command 0x2 completed. inCount: 2 data:0x5Command 0x1 completed. inCount: 2 data:0x1001Command 0x16 completed. inCount: 2 data:0x40e0Command 0xa completed. inCount: 2 data:0x0Command 0xb completed. inCount: 2 data:0x0Command 0x12 completed. inCount: 2 data:0xffffCommand 0x13 completed. inCount: 2 data:0xffffCommand 0xf completed. inCount: 2 data:0x1760Command 0x10 completed. inCount: 2 data:0x1795SmartBattery: finished polling type 4
FB0: Complete modeset
Command 0x2 completed. inCount: 2 data:0x5Command 0x1 completed. inCount: 2 data:0x1001Command 0x16 completed. inCount: 2 data:0x40e0Command 0x53 completed. inCount: 2 data:0x0Command 0x54 completed. inCount: 2 data:0xe443Command 0xa completed. inCount: 2 data:0x0Command 0xb completed. inCount: 2 data:0x0Command 0xc completed. inCount: 2 data:0x1Command 0x11 completed. inCount: 2 data:0xffffCommand 0x3f completed. inCount: 2 data:0x10daCommand 0x3e completed. inCount: 2 data:0x10daCommand 0x3d completed. inCount: 2 data:0x10d9Command 0x3c completed. inCount: 2 data:0x0Command 0x12 completed. inCount: 2 data:0xffffCommand 0x9 completed. inCount: 2 data:0x328dCommand 0x8 completed. inCount: 2 data:0xbdeCommand 0x17 completed. inCount: 2 data:0xcbCommand 0x13 completed. inCount: 2 data:0xffffCommand 0xf completed. inCount: 2 data:0x1760Command 0x10 completed. inCount: 2 data:0x1795SmartBattery: finished polling type 2
USBMSC Identifier (non-unique): AA515FFJBIUBRWW6J5 0x5dc 0xa83a 0x1100, 3
FB0: Complete modeset
IOConsoleUsers: time(0) 0->0, lin 1, llk 0,
IOConsoleUsers: gIOScreenLockState 1, hs 0, bs 0, now 0, sm 0x0
loginwindow is not entitled for IOHIDLibUserClient keyboard accessFB0: Complete modeset
IOConsoleUsers: time(0) 0->0, lin 1, llk 0,
IOConsoleUsers: gIOScreenLockState 1, hs 0, bs 0, now 0, sm 0x0
FB0: Complete modeset