Why does mass storage send a 16k data packet into multiple data packets?

[junxiaojun]

Problem

private fun transferOneCommand(command: CommandBlockWrapper, inBuffer: ByteBuffer): Int

I have a 16k data packet. Why is it divided into 5 reads? Can I read 16k data packets at once? Instead of subcontracting to read

Expected behavior

Actual behavior

Stacktrace of Excpetion

(if exists)

Code where problem occurs

[junxiaojun]

@magnusja

[magnusja]

Depends on the flash drive. Oftentimes, some support larger ones, some do not.

But anyways, the ScsiWrite and Read commands currently only support some smaller chunk sizes.
See here, https://github.com/magnusja/libaums/blob/develop/libaum

s/src/main/java/me/jahnen/libaums/core/driver/scsi/commands/ScsiRead10.kt

Currently, there is a read command 32, which probably speeds up transfer by a lot if usb drive supports it. See here: https://www.seagate.com/files/staticfiles/support/docs/manual/Interface%20manuals/100293068j.pdf

I am happy to take a PR. But as the USB spec is complex, it is hard to support each of these flawlessly.

[junxiaojun]

@magnusja
Thank you. I am very happy to see your reply. The problem has been solved. Thank you very much.