Hard disk effected by icloud?

Usually, an error 4013 on a 6 series device is data corruption in the NAND. This can be repaired but it will require advanced soldering skills and it will also require a special NAND programmer as the metadata of your NAND needs to be repaired.

If the other device has a larger capacity NAND, it could be transferred over but it will require the same kind of actions as above. If you are interested in doing this, you will have to find a repair shop that does micro-soldering repairs.

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@refectio - Even if he was able to get the NAND replaced or reprogramed. The ID has been corrupted and the iCloud account is messed up as he can't gain access from a second system. This really needs Apple to fix.

由 Dan 完成的 2018年3月19日

@danj unless the NAND is completely fried (which is rare), the NAND programmer can read the metadata off the NAND and it will be used to reprogram the replacement NAND. The data is scrambled but not the metadata.

The actual metadata consists of the device serial number, model number, country code, mac address and BT address. All of this info can also be found through other measures under certain circumstances.

由 Minho 完成的 2018年3月19日

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@refectio - Even if he was able to get the NAND replaced or reprogramed. The ID has been corrupted and the iCloud account is messed up as he can't gain access from a second system. This really needs Apple to fix. — Dan
@danj unless the NAND is completely fried (which is rare), the NAND programmer can read the metadata off the NAND and it will be used to reprogram the replacement NAND. The data is scrambled but not the metadata.

The actual metadata consists of the device serial number, model number, country code, mac address and BT address. All of this info can also be found through other measures under certain circumstances. — Minho