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Activity(Process):

  1. Select MF.
  2. Create DF(with 800 bytes).
  3. Select DF.
  4. Create EF(with 800 bytes).
  5. Select MF.
  6. Delete DF.

The activity shown above was repeated several times such that after some time i got error in creating EF (memory not available in file)(step 4). After some time i got the same error in creating DF(step 2). I feel like im loosing memory and not able to gain back after deletion. Please any suggestion woulf be helpful.

vlp
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Uday walvekar
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  • What APDU, do you use for delete EF? – jiten Feb 15 '17 at 07:00
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    My best assumption is, that deleting the DF leaves the EF as existing, but no longer accessible. Try deleting the EF explicitly first before deleting the DF. – guidot Feb 15 '17 at 07:33
  • @vikky APDU = 00 e4 00 00 02 (2 bytes DF file ID) ...... also i have tried selecting the DF and using 00 e4 00 00..... – Uday walvekar Feb 15 '17 at 11:09
  • @guidot Yeah looks like possible reason.. thanks will check that. But another issue is that i dont know the complete memory size of my card. Now after trying with new methods i still cannot verify that suggested delete procedure is the right one. The specs say you can pass the id to delete or not pass to delete the selected one. – Uday walvekar Feb 15 '17 at 11:13
  • As per my knowledge, Scosta card comes with 32K and 64k memory. – jiten Feb 15 '17 at 11:20
  • What is the ATR of the card – jiten Feb 15 '17 at 11:20
  • ATR = 0x3b 0x3f 0x11 0x0 0x80 0x12 0x0 0x91 0x31 0xc0 0x64 0xe 0x1 0x46 0xac 0x72 0xf7 0x41 0x5 – Uday walvekar Feb 15 '17 at 11:26
  • Yeah i was expecting 64K memory. Is there any way to get back the lost memory. – Uday walvekar Feb 15 '17 at 11:27

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