M1 Card Common Problems and Handling Suggestions
Lost password: A password authentication error occurs when reading and writing again, and the card cannot be accessed. In particular, when the block 3 programming operation is performed on the MF card, the control value of the relevant card number, KeyA, KeyB, etc. must be recorded in time, and a dedicated person should manage the password file.
Incorrect settings: The block 3 control block of the MF1 card is not well understood and the wrong understanding causes the settings to cause incorrect settings. According to Table 2, the control block of the Mf1 card currently has only 8 data block access control permissions and 8 control block setting rights. Any code combination exceeding these 16 permissions will directly cause an error setting and cause the card to be scrapped!
Extreme authority: When the access control bit of block 3 is C13C23C33=110 or 111, it is called extreme authority. Except for special applications, it is generally not used! Carefully weigh the read/write access of the password and enable the lock of the access control before it is enabled. Otherwise, even if the password is encrypted, the locked data block cannot be read (invisible). !
Poor equipment: Poor equipment will directly affect the read/write performance of the card. The equipment for programming block 3 of the MF card must be very reliable in performance and stable in operation. It is recommended to use a well-known reading and writing machine built by Philips' original read-write module!
Programming interference: In the program operation of block 3, there can be no 'IO' interrupts or interruptions! Including the simultaneous operation of more than two programs interfere with even PC bad switching power supply ripple interference, otherwise, unsuccessful write The operation will cause a certain sector to be locked, resulting in an error when the sector is accessed again.
Data error: caused by reading and writing cards at critical distance points. Normal readers, especially writers, should avoid reading the card in a critical state (just read the card's distance). Because the data transfer in the critical state is very unstable! It is easy to cause reading and writing mistakes!
Human error: For example, the password loading operation mistakenly mistakenly loads KeyA into KeyB, or mistypes other manufacturer's initial password values ​​such as a0a1a2a3a4a5, b0b1b2b3b4b5 into the company's MF1 card, or in the initial state ( Password A = 000000000000 hidden state, the actual is ffffffffffff, control bit = FF078069, password B = ffffffffffff visible) If you inadvertently delete KeyA = 000000000000 and then re-enter 12 '0', and load it! At this time has been inadvertently Change the original 12 hidden 'f's of KeyA to 12 '0's. The consequences can be imagined!
Card failure: There is no data transfer for reading and writing, and the reader reports a 'search card error'! The card is distorted beyond the standard and is bent to cause the internal circuit to break.
Reading and writing distance is too close: it is related to the reader's performance. The standard MF1 card has a read/write distance of up to 10 cm (the maximum distance tested on Philips' standard read/write machines), and the domestic famous brand readers are generally up to 5-10 cm. The smaller the size of the key chain card, of course, the reading and writing distance is much closer than the standard card, but as long as the reliable reading and writing distance ≥ 5 ~ 10mm or more, generally will not affect the normal use!
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