BliBli: SanDisk Ultra Dual Drive 64GB

I have purchased two "Sandisk Ultra Dual Drive 64GB" flash drives online from the same online seller at BliBli. It turned out that the two disks were from different distributors with different performances! Not expecting this, I ignored to note which flash drive came from which distributor.

I performed three similar read/write tests on both flash drives. The result is as follows:

=========================
test1: 0:05:18 vs 0:12:33
test2: 0:21:40 vs 0:50:41
test3: 0:13:24 vs 0:34:18
=========================

Both capacities are around 64GBytes, but one can write at around 30Mbps while the other is only around 10Mbps.

SLOW DISK (10Mbps write)

FASTER DISK (30 Mbps write)

Next Purchase

I bought two "SanDisk CZ550 64GB Ultra Curve USB 3.2" from the same seller this time but through Tokopedia. The GREEN one comes from ASTRINDO, while the BLUE one comes from DATASCRIPT.

Henceforth, those originating from ASTRINDO are called "GREEN," while those deriving from DATASCRIPT are called "BLUE."

TESTING

time dd if=/dev/zero of=/dev/sdc bs=4M

GREEN (15.2 MBps)

61524148224 bytes (62 GB, 57 GiB) copied, 4056.29 s, 15.2 MB/s
real	67m36.293s
user	0m0.000s
sys	1m23.434s

BLUE (16.1 MBps)

61524148224 bytes (62 GB, 57 GiB) copied, 3818.13 s, 16.1 MB/s
real	63m38.136s
user	0m0.000s
sys	1m24.571s

DISCLAIMER

This is HOW Me Do IT! Grrr... this blog memo is mainly written for OWN PURPOSES. This post is based on "Google Here, There, and Everywhere". Whether this is PLAGIARY or RESEARCH, there has never been a claim that this is an original work, nor is it necessarily the best solution, and not for Scopus consumption :). Please provide feedback, especially if you have alternative explanations. Hopefully, this note will be helpful in the future when you have forgotten how to solve this trivia problem.

DISKLAIMER

INIlah yang KUlakukan! Grrr... memo blog ini terutama ditulis untuk KEPERLUAN SENDIRI. Tulisan ini berbasis "Google Sana, Google Sini, Coba Itu, Coba Ini, Lalu Tanya-tanyi". Entah ini PLAGIAT, entah ini RISET, yang jelas tidak pernah ada klaim bahwa ini merupakan karya asli, serta belum tentu pula merupakan solusi terbaik, serta bukan untuk konsumsi Scopus :). Mohon kiranya memberikan tanggapan, terutama jika memiliki solusi alternatif. Semoga catatan ini akan bermanfaat di masa mendatang, saat sudah lupa cara menyelesaikan masalah trivia ini.

This is the Way!

--- Rahmat M. Samik-Ibrahim
--- --- --- revisi 02--24-Dec-2023