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WD Black Mobile Hard Drive: 2.5 Inch, 7200 RPM, SATA II, 16 MB Cache, 5 Year Warranty - WD7500BPKT
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From Western Digital
This report was last updated 8/7/2021.
Refresh the report to view the most up-to-date data available:
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Report Info:
Note: While Amazon.com claims 3,277 Ratings, we counted 2,112 Reviews available on their site.
Note: We only analyze "reviews" and ignore one-tap "ratings".
Note: We only analyze "reviews" and ignore one-tap "ratings".
Report Card
Pass Overall Grade
FAIL Suspicious Reviewers
FAIL Phrase Repetition
FAIL Overlapping Review History
WARN Deleted Reviews
WARN Rating Trend
PASS Unverified Purchases
PASS Word Count Comparison
PASS Reviewer Participation
PASS Reviewer Ease
PASS Brand Repeats
PASS Incentivized Reviews
Most Trusted Reviews
good job [Go to full review]
Nov 13, 2017
100%
TRUST
TRUST
- Verified Purchaser
- Easy Grader (avg. rating: 4.9)
Least Trusted Reviews
I really am completely satisfied with the product and with ... [Go to full review]
Jan 2, 2013
0%
TRUST
TRUST
- Verified Purchaser
- Created on a high volume day
- Single-Day Reviewer (posted all reviews on Jan 2, 2013)
- Overlapping Review History: reviewed 1 of 9 top products
- Easy Grader (avg. rating: 5.0)
Analysis Details
Fail Suspicious Reviewers
Take-Back Reviewers
993 of the 2,112 reviewers have had at least one of their past reviews for another product deleted. While this is more Take-Back Reviewers than we'd expect to see, the discrepancy in ratings between the Take-Back Reviewers and reviewers who don't have any deleted reviews in their history isn't significant enough to rule out the possibility of it being due to random chance.
Single-Day Reviewers
39 of the 2,112 reviewers have written multiple reviews but posted all of them on a single day. The Single-Day reviewers have rated this product an average of 4.9 while all other reviewers rated this product an average of 4.5. Based on our statistical modeling, the discrepancy in average rating between these two groups is significant enough to believe that the difference is not due to random chance, and may indicate that there are unnatural reviews.
Fail Phrase Repetition
Reviews that contain one of these phrases are NOT necessarily devalued; read more about how this test works here.
Common Phrases in Reviews:
Show MoreShow Less
51 reviews
(4.5/5)
(4.5/5)
41 reviews
(4.7/5)
(4.7/5)
37 reviews
(4.4/5)
(4.4/5)
39 reviews
(4.4/5)
(4.4/5)
31 reviews
(4.6/5)
(4.6/5)
26 reviews
(4.7/5)
(4.7/5)
23 reviews
(4.3/5)
(4.3/5)
23 reviews
(4.7/5)
(4.7/5)
23 reviews
(4.6/5)
(4.6/5)
20 reviews
(4.6/5)
(4.6/5)
137 of the 2,112 total reviews for this product use substantial repetitive phrases between them. These reviewers have rated this product an average of 4.7 while reviews without substantial repetitive phrases rated this product an average of 4.5. Based on our statistical modeling, the discrepancy in average rating between these two groups is significant enough to believe that the difference is not due to random chance, and may indicate that there are unnatural reviews.
Fail Overlapping Review History
Reviewers of this product have ALSO reviewed the following products:
4% also reviewed:
Vantec NexStar CX NST-200S2-BK 2.5-Inch SATA to... by Vantec
2% also reviewed:
Transcend 8 GB Class 10 SDHC Flash Memory Card by Transcend
2% also reviewed:
4GB, 204-pin SODIMM, DDR3 PC3-12800, by Micron
2% also reviewed:
Apricorn SATA Wire Notebook Hard Drive Upgrade... by Apricorn
2% also reviewed:
Certified Refurbished Fire TV Stick with Alexa... by Amazon Renewed
1% also reviewed:
SanDisk Ultra 32GB UHS-I/Class 10 Micro SDHC... by SanDisk
275 of the 2,112 reviewers have substantial overlapping product review history. These reviewers have rated this product an average of 4.7 while the reviewers who have a more unique product review history rated this product an average of 4.5. Based on our statistical modeling, the discrepancy in average rating between these two groups is significant enough to believe that the difference is not due to random chance, and may indicate that there are unnatural reviews.
Warn Deleted Reviews
We discovered a total of 19 deleted Reviews for this product, with an average rating of 4.4. Even though deleted reviews don't affect the average rating, the fact that action was taken to delete reviews raises some red flags about the integrity of the reviews for the product as whole.
There are a few limitations to keep in mind regarding the Deleted Reviews test:
- We don't have a magic ability to collect every single deleted review; we can only identify reviews as deleted if we collect them on one date and then notice they are no longer visible on a subsequent date.
- We have no information on reviews that were never published in the first place.
- We also don't know why these reviews were removed. It could be action from the platform, personal decision by the review author, part of an entire account closure, even some data error on our part, etc.
Warn Rating Trend
-
- 10%
- Created over 39 days
We counted 2,112 reviews for this product over the span of 4,380 days, an average of 0.5 reviews per day. If these reviews were created randomly, there would be a 99.9% chance that we would see 4 or fewer reviews on any given day.
However, we see the following 39 days exceeding this threshold:In total, we found that 217 reviews were created on just 39 days. Although any days with a larger number of reviews than expected is suspicious, these reviews do not appear to have a significant impact on the overall rating.
Pass Unverified Purchases
108 of the 2,112 total reviews for this product are unverified purchases. This is within an acceptable range and it does not appear to be significantly affecting the overall rating for this product.
Unverified purchases may be the result of Kindle Unlimited readers, buyers who didn't pay full price, or reviewers who did not purchase the product at Amazon. Read more about our Unverified Purchases test.
Pass Word Count Comparison
-
- 0%
- Have an overrepresented word count
We didn't find any review word count groups that had a statistically significant greater concentration than what we'd expect to see in this category.
Read more about our Word Count Comparison test.
Read more about our Word Count Comparison test.
Pass Reviewer Participation
-
- 0%
- From reviewers with an overrepresented participation
We didn't find any participation groups that had a statistically significant greater concentration than what we'd expect to see in this category.
Read more about our Reviewer Participation test.
Read more about our Reviewer Participation test.
Pass Reviewer Ease
The ease score is the average rating for all reviews that a given reviewer submits. The average ease score for reviewers of this product is 4.3, while the average ease score for reviewers in this category is 4.3.
4.3 Product's Average Ease Score
4.3 Category's Average Ease Score
Read more about our Reviewer Ease test.
Pass Brand Repeats
Brand Repeaters
338 of the 2,112 reviewers have reviewed other products for this brand. This is within an acceptable range and it does not appear to be significantly affecting the overall rating for this product.
Pass Incentivized Reviews
On Oct 3, 2016, Amazon prohibited incentivized reviews, however we still test for them since there are still millions in our dataset.
-
- 0%
- Admitted to receiving an incentive
We didn't detect any reviews that used language indicating they were incentivized.
Read more about our Incentivized Reviews test. Check out our study showing that Incentivized Reviewers are much more likely to leave a positive review.
Read more about our Incentivized Reviews test. Check out our study showing that Incentivized Reviewers are much more likely to leave a positive review.