- Obtained from: Amazon
- Price paid: $9.41*
- Advertised size: 64GB
- Logical capacity: 63,281,561,600 bytes
- Physical capacity: 63,281,561,600 bytes
- Fake/skimpy flash: Skimpy (1.12% skimp)
- Protected area: 134,217,728 bytes
- Adjusted skimp: 0.91%
- Speed class markings: Class 10, U3, V30, A2
- CID data:
- Manufacturer ID:
0xad - OEM ID:
0x4c53(ASCII:LS) - Product name:
0x5553443030(ASCII:USD00) - Product revision:
0x10
- Manufacturer ID:
| Sample # | 1 | 2 | 3 | 4 | Average |
|---|---|---|---|---|---|
| Manufacture date | Jan 2024 | Jan 2024 | Jan 2024 | Jan 2024 | N/A |
| Serial number | 0x3a10ae5f | 0x3a10ae56 | 0x3207eeed | 0x3056d43c | N/A |
| Sequential read speed (MB/sec) | 90.19 | 89.64 | 89.65 | 91.76 | 90.31 |
| Sequential write speed (MB/sec) | 39.84 | 39.21 | 39.43 | 46.44 | 41.23 |
| Random read speed (IOPS/sec) | 2,402.61 | 2,264.25 | 2,234.53 | 2,368.98 | 2,317.59 |
| Random write speed (IOPS/sec) | 457.89 | 739.63 | 725.03 | 736.56 | 664.78 |
| Read/write cycles to first error | Not yet determined | 955 | 1,814 | Not yet determined | 1,385 |
| Read/write cycles to complete failure | Not yet determined | Not yet determined | Not yet determined | Not yet determined | Not yet determined |
| Total days to complete failure | Not yet determined | Not yet determined | Not yet determined | Not yet determined | Not yet determined |
| Card reader used | JJC CR-UTC4AC | JJC CR-UTC4AC | JJC CR-UTC4AC | JJC CR-UTC4AC | N/A |
| Package front |  |  | N/A | ||
| Package back |  |  | N/A | ||
| Package top |  |  | N/A | ||
| Card front |  |  |  |  | N/A |
| Card back |  |  |  |  | N/A |
* These cards were sold as a two-pack; the price shown represents half the price of the two-pack.
Discussion
Amazon has been slapping their brand name on just about everything with their Amazon Basics brand — and microSD cards have been no exception. I don’t think I’ve ever bought any electronics in the Amazon Basics brand — so this will be a first for me.
Amazon obviously doesn’t have their own silicon foundries (or do they?), so there’s a question to be asked: who made this card? The sources that I normally go to don’t have anything on manufacturer ID 0xad. I’ve seen this manufacturer ID (and OEM ID 0x4c53) a few times now: with the Chuxia 32GB, the OV 32GB, and — most importantly — the Lexar Blue 633x 32GB. The Lexar brand was purchased by Longsys in 2017, so I think I’m just going to call it: I think manufacturer ID 0xad belongs to Longsys. All of their cards that I’ve seen so far have OEM ID 0x4c53 — which, when translated into ASCII, becomes LS — which I believe to be an abbreviation for Longsys. So yeah — I think these cards were manufactured for Amazon by Longsys.
Performance on these cards was decent. All scores were above average, with two of the three samples getting random write speeds that were more than one standard deviation above average. The lowest score was the sequential read speed on sample #3; at 89.65MB/sec, it came in at the 62nd percentile.
Endurance tests for all four cards are still ongoing:
- Sample #1 has survived 4,034 read/write cycles so far and has not yet experienced any errors.
- Sample #2’s first error was a four-sector wide address decoding error during round 956. It has survived 2,166 read/write cycles in total so far.
- Sample #3’s first error was a four-sector wide address decoding error during round 1,815. It has survived 2,182 read/write cycles in total so far.
- Sample #4 has not yet reached the 2,000 read/write cycle mark. It is estimated to reach this point sometime in November 2024.
October 1, 2024 (current number of read/write cycles is updated automatically every hour)