I made a new bootable disk today, and it turned out that it could clone. But I have two hard drives. Only the WD one works, the Samsung one doesn't. Here's the detail: Last October, I ran debug on the WD disk, shut down halfway and exited. When I booted up again, I couldn't run Ghost or install systems other than DOS. Whenever I tried to install, there was the above - mentioned prompt. I also changed the bootable disk, but it didn't work. It could be used as a slave disk. Then I used the Samsung hard drive as the master disk. In the past few days, to solve the problem, I made many attempts. Generally, when running U无忧's pq; fdiskgen; fdisk, etc., it prompts that emm386 is running, memory is limited to 32MB. Then it can't operate and exits automatically. If you run Ghost or install Windows, it prompts: "the program too big to fit in memory". Once I ran a partition software, and there was the following prompt: "emm386 has detected error #u^5 in an application at memory address 08cd:3e80. To minimize the chance of data loss, emm386 has halted your computer. For more information, consult your documentation." After trying around, the Samsung hard drive also had the same problem. I asked WD customer service, and they said that zeroing it would work. The day before yesterday, I booted with a floppy disk and ran fdisk, set the active partition, and then both disks could run Ghost. When I booted with the WD as the master disk, the Samsung disk disappeared, and all the data was gone. I zeroed the Samsung disk and partitioned it, but it was still the same prompt, and the WD couldn't run Ghost either. Until just now, after changing the bootable disk, the WD could run Ghost, but the Samsung disk was still not working, and there were the above - mentioned prompts. Whether the WD disk will have similar problems in the future is unknown. What is this problem? I'm looking forward to the guidance of all the experts!