On Saturday 2017-02-11 11:46, Wols Lists wrote:
On 11/02/17 07:17, Andrei Borzenkov wrote:
I suspect some problem with BIOS/4K disks. I have seen reports about problems with such disks, but was not able to find out what was wrong for multiple reasons. Could you provide output of
For info, when 4K disks first came out, they emulated 512B disks. So any bios that assumed 512B sectors would work fine. Newer 4K disks have dropped the emulation, so that will break non-compliant bioses.
The other big problem is that if your fdisk or whatever assumed 512B, they had a habit of NOT aligning on a 4K boundary. I guess this now breaks also, and even if it didn't, it clobbered performance as the emulation code was forever having to read the disk, update across boundaries, and write it back. Two reads and a write for what the OS thought was a simple write ...
That was the problem. I put in a 132 GB pen drive and now everything is
work.
Thanks,
--
Boyd Gerber