Records in the Recycle Bin don’t count against your org’s storage usage. However, Salesforce uses your storage limit to determine the maximum number of records allowed in your Recycle Bin. Your Recycle Bin can contain 25 times your MB storage capacity as records. For example, an org with a storage allocation of 2,000MB (2GB) can have 50,000 records in the Recycle Bin: 25 x 2,000 = 50,000 records.
Records in the Recycle Bin don’t count against your org’s storage usage. However, Salesforce uses your storage limit to determine the maximum number of records allowed in your Recycle Bin. Your Recycle Bin can contain 25 times your MB storage capacity as records. For example, an org with a storage allocation of 2,000MB (2GB) can have 50,000 records in the Recycle Bin: 25 x 2,000 = 50,000 records.
Please review below link for more information.
https://help.salesforce.com/articleView?id=home_delete.htm&type=5 (https://help.salesforce.com/articleView?id=home_delete.htm&type=5)
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Vinay Kumar
Those are in MB.
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