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Date:   Thu, 19 Sep 2019 13:54:54 -0400 (EDT)
From:   Alan Stern <stern@rowland.harvard.edu>
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To:     Andrea Vai <andrea.vai@unipv.it>
cc:     Johannes Thumshirn <jthumshirn@suse.de>,
        Jens Axboe <axboe@kernel.dk>,
        USB list <linux-usb@vger.kernel.org>,
        SCSI development list <linux-scsi@vger.kernel.org>,
        Himanshu Madhani <himanshu.madhani@cavium.com>,
        Hannes Reinecke <hare@suse.com>,
        Ming Lei <ming.lei@redhat.com>, Omar Sandoval <osandov@fb.com>,
        "Martin K. Petersen" <martin.petersen@oracle.com>,
        Greg KH <gregkh@linuxfoundation.org>
Subject: Re: Slow I/O on USB media after commit f664a3cc17b7d0a2bc3b3ab96181e1029b0ec0e6
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On Thu, 19 Sep 2019, Andrea Vai wrote:

> BTW, another question: Alan refers to the slow media as a "consumer-
> grade USB storage device". What could I do to identify and buy a "good
> media"? Are there any features to look for?

In general, USB flash drives should not be expected to work as well as 
an actual disk drive connected over USB.

Alan Stern