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Coolmax CD-509-U2 returned an error on a request to write data to the media (used as a backup device). Error reported: Invalid Command There may be a hardware or media problem

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Sounds like the devices is not mounted for some reason.
Hardware, Driver ....

Posted on Apr 18, 2008

  • Martin J Stadler
    Martin J Stadler Apr 18, 2008

    My solution was appropriate although perhaps too brief.

    Windows often returns a nondescript: "Invalid command" errors when it has a problem reading from or writing to a mass storage device, such as hard drive or a CD/DVD burner.

    This means that the logical data channel leading to this device is somehow disrupted or broken. Unfortunately there are many reasons for this to happen, for example:

    In the case of removable devices, such as your USB box, the device is logically "mounted" when the devices is plugged in and "dismounted" when it is unplugged. This means that windows accesses the corresponding device drivers, and creates a stack of software subroutines to handle the data transfers. This is a very complex, nested structure of layered program code, similar to that of a military command structure, with many opportunities for error. The problem is that Windows does not identify the exact error that caused the problem.

    Possible causes are:
    1) The USB link has failed, either through hardware or software (driver)

    2) The device driver uploaded from the USB device has failed
    or collides with another driver in resource allocations

    3) The windows device driver has failed for the same reason

    4) The physical drive has failed

    5) The media in the drive, hard or removable is corrupt.

    6) The media is read protected and you are trying to write to it.

    7) Another, unrelated windows error is causing a device conflict

    8) You have a virus or a root kit, such as the infamous SONY rootkit, which was designed to permanently alter your computer in order to prevent you from copying music CD's

    9) You may have a similar rootkit installed by a video game, such as the "STAR-FORCE" anti-piracy rootkit, which again will corrupt your device drivers.

    In order to fix this you need to isolate the failing device: The drive
    or Windows on your computer. Try the drive on another machine. If the problem moves with it, it's the drive. Otherwise save your data, reformat the machine and re-install windows.

    You may want to try a reputable anti-virus/ anti rootki program before you do that.

    Rootkits, by design, are extremely difficult to detect or remove, because they exploit operating system weaknesses and inconsistencies to make themselves invisible from the operating system as well as from anti-virus programs. Some-kits can even corrupt the firmware inside the physical drive. This is the latest state of the art in computer malware.

    I hope this is more helpful

    Martin


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COMMON FTP ERROR CODES


~~~~~~~~~COMMON FTP ERROR CODES~~~~~~~~~~
# Description

110 Restart marker reply. In this case, the text is exact and not left to the particular implementation; it must read: MARK yyyy = mmmm where yyyy is User-process data stream marker, and mmmm server's equivalent marker (note the spaces between markers and "=").

120 Service ready in nnn minutes.

125 Data connection already open; transfer starting.

150 File status okay; about to open data connection.

200 Command okay.

202 Command not implemented, superfluous at this site.

211 System status, or system help reply.

212 Directory status.

213 File status.

214 Help message.On how to use the server or the meaning of a particular non-standard command. This reply is useful only to the human user.

215 NAME system type. Where NAME is an official system name from the list in the Assigned Numbers document.

220 Service ready for new user.

221 Service closing control connection.

225 Data connection open; no transfer in progress.

226 Closing data connection. Requested file action successful (for example, file transfer or file abort).

227 Entering Passive Mode (h1,h2,h3,h4,p1,p2).

230 User logged in, proceed. Logged out if appropriate.

250 Requested file action okay, completed.

257 "PATHNAME" created.

331 User name okay, need password.

332 Need account for login.

350 Requested file action pending further information

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425 Can't open data connection.

426 Connection closed; transfer aborted.

450 Requested file action not taken.

451 Requested action aborted. Local error in processing.

452 Requested action not taken. Insufficient storage space in system.File unavailable (e.g., file busy).

500 Syntax error, command unrecognized. This may include errors such as command line too long.

501 Syntax error in parameters or arguments.

502 Command not implemented.

503 Bad sequence of commands.

504 Command not implemented for that parameter.

530 Not logged in.

532 Need account for storing files.

550 Requested action not taken. File unavailable (e.g., file not found, no access).

551 Requested action aborted. Page type unknown.

552 Requested file action aborted. Exceeded storage allocation (for current directory or dataset).

553 Requested action not taken. File name not allowed.

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